Historical underground quarrying: A multidisciplinary research in the Caumont quarry (c. 13th–19th centuries), France

ORIGINAL ARTICLE Historical underground quarrying: A multidisciplinary research in the Caumont quarry (c. 13th–19th centuries), France Daniel Ballesteros 1,2 | Carole Nehme 1 | Bastien Roussel 1 | François Delisle 3 | Edwige Pons-Branchu 4 | Damase Mouralis 1 1 UMR 6266 IDEES, Université of RouenNormandie/CNRS, Mont Saint-Aignan, France 2 Departamento de Geodin amica, Universidad de Granada, Granada, Spain 3 Laboratoire du GRHIS EA 3831, UFR des Lettres et Sciences Humaines, Université de Rouen-Normandie, Mont-Saint-Aignan, France 4 Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEACNRS-UVSQ, Université de Paris-Saclay, Gif-sur-Yvette, France Correspondence Daniel Ballesteros, UMR 6266 IDEES, Université of Rouen-Normandie/CNRS, Mont Saint-Aignan CEDEX, France. Email: [email protected]vi.es Abstract Quarries represent ‘landscapes archives’as they supplied the stone required for historical buildings. Among them, the Caumont ancient quarry stands out in northern France, with its huge dimensions and its historical role, providing building stones at a regional scale since at least the Middle Ages. The present study aims to approach the quarrying methods used over time in Caumont by means of an optimized methodological approach. The designed methodology combines (1) the 3D modelling of the quarry, (2) archaeological prospection, (3) stratigraphical and microscopical study of the quarried bedrock, and (4) the geochronological approach in stalagmites precipitated inside the quarry. The studied quarry of Caumont was excavated as an open-cast quarry beginning with the escarpments along the River Seine and transformed later to an underground quarry supported by contoured bedrock pillars. The underground quarry with its 12 km of galleries shows a chambers-and-pillars pattern style excavated using two methods, producing an inferred volume of 273,529 m 3 of building stone. The U–Th dating of two stalagmites suggests that quarrying activity had begun since at least the early medieval period and agrees with the excavation techniques and historical documents. KEYWORDS 3D modelling, historical quarrying, multidisciplinary research, underground quarry Received: 19 February 2021 Accepted: 25 January 2022 DOI: 10.1111/arcm.12758 This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. © 2022 The Authors. Archaeometry published by John Wiley & Sons Ltd on behalf of University of Oxford. Archaeometry. 2022;64:849–865. wileyonlinelibrary.com/journal/arcm 849 INTRODUCTION Since Antiquity, quarries have played an important role providing stones for building because of the relative high compressive strength, durability and natural abundance of rocks (Klemm & Wiggins, 2016). Quarrying activity reflects the transformations of ancient societies, from sporadic works supplying local demands, to the development of an organized industry linked to technological progress (Djuri c, 2019; Pivko, 2018; Storemyr & Heldal, 2017). Indeed, quarrying represents a powerful economic activity, frequently strategic and associated with many outstanding civilizations (Bevan & Bloxam, 2016; Fort et al., 2019; Zaid et al., 2015). The diffusion of building stones, whose provenance could be traced back to the quarries, is a powerful tool to establish ancient trade routes and the structuration of territories (Freccero, 2015; Shekofteh et al., 2020; Wilson & Bowman, 2018). Consequently, building stones represent valuable archaeomaterials and their related quarries can be considered as ‘archives for past landscapes’ (Bevan & Bloxam, 2016). A historical review of underground quarrying is included in Supplementary Data 1. This activity was scarce throughout history compared to open-cast exploitations. Locally, the increased demand for suitable stone for construction and the scarcity of such material in natural outcrops promoted the development of underground quarries to continue exploiting laterally specific rocky volumes (Attanasio et al., 2015; Mileusni c et al., 2019; Storemyr & Heldal, 2017). Underground works implied additional engineering challenges related to groundwater and the stability of the galleries (Gao et al., 2019; Perrotti et al., 2019). Even though technical similarities exist between open-cast and underground quarries, particular techniques were applied to search for stable and cost-effective material (Mileusni c et al., 2019; Pivko, 2018;Rožicˇ et al., 2018). Underground quarries usually exploited carbonate rocks since its relative high cementation favours the stability of excavation volumes, allowing the natural preservation of large, excavated galleries without any support structure (Gao et al., 2019; Scotto di Santolo et al., 2015). Research conducted in ancient underground quarries focused mainly on the archaeological aspects of such ancient structures (Pivko, 2017; Storemyr & Heldal, 2017; Tziligkaki & Stamatakis, 2016). These studies combined a variety of methods such as the collection of historical documents (e.g., ancient pictures, maps) and the analysis of tool marks and inscriptions to define the excavation technique and geometry of the quarries. Archaeological studies were usually complemented by the geological characterization of the exploited stone via optical microscopy and geochemical analysis in order to trace the origins of dimensional stones used in landmark buildings (Attanasio et al., 2015; Brilli et al., 2018; Korkanç, 2018). All this data were compiled in a regional or a national database (Hyslop et al., 2010; Russell, 2017; Shawarby et al., 2009), sometimes using geographical information systems (Orbons, 2018; Turmel et al., 2016). In addition, quarries were investigated to assess the quality of the produced stone (De Kock et al., 2015; Korkanç, 2018) or the stability of the structure throughout geophysical investigations (Al Heib et al., 2015; Gao et al., 2019; Perrotti et al., 2019). The technological knowledge of underground quarrying activity specifically for the medieval and modern periods is poorly investigated. Useful data such as rates of stone production and quantified volume of excavated stones remain difficult to reconstruct. Our study investigates a large ancient underground quarry with 12 km of galleries excavated since the medieval period. The quarry named Caumont and located in Normandy, northern France, had a regional relevance in the production of the Normandy chalkstone, a building stone designated as Global Heritage Stone Resource for its relevant historical role (Ballesteros et al., 2021). Our work aims to define the technological knowledge developed in Caumont quarry by reconstructing the excavation techniques and inferring production and excavation rates. For that, a multidisciplinary approach was conducted combining geomatics, archaeological, geological and geochronological techniques. 850 BALLESTEROS ET AL. 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License SETTINGS The Seine valley has been extensively quarried with dozens of underground excavated galleries to supply building stone to Paris and surroundings areas of northern France since Roman times (Fronteau et al., 2010). Historical quarrying in the Caumont area is located between La Bouille and Mauny, on the south bank of the River Seine, 25 km southwest of Rouen (Figure 1). A huge volume of chalkstone was exported from this area to the buildings of the Seine Valley during the Middle Ages (Ballesteros et al., 2021) and following centuries, competing with other construction workshops in Caen, Vernon and Paris, among others (Dujardin, 2004,2006). The quarried bedrock in Caumont corresponds to dedolomitized chalk, a singular coccolithic limestone of the Upper Cretaceous in age (Ballesteros et al., 2020,2021). This quarrying area includes more than 10 exploitations (e.g., Caumont, Maquisards, Pylone, Jacqueline); the major one is specifically named Caumont quarry (Sibout, 2011; Tomat, 2009), the openings of which are located at 200 m from the River Seine (Figure 1b). Historical works revealed that the Caumont quarrying area was active from the Middle Ages to 1906 CE, supplying stone for buildings located along the lower Seine valley (Dujardin, 2004,2006; Lardin, 1998,2016). Recently, geoarchaeological studies suggested that Caumont provided stones during the 10th–14th centuries, for buildings located 40 km away from the quarry site (Ballesteros et al., 2022). This provision area, larger than what is known FIGURE 1 (a) Location of Caumont quarry in Western-Central Europe. (b) Geological map of the surroundings of Caumont quarry, showing geological formations (Fms) as defined in Lasseur et al. (2009). Geological data are after the Bureau de Recherches Géologiques et Minières (Quesnel et al., 2008; Van Lint et al., 2003). (c) Caumont quarry and other nearby underground exploitations [Color figure can be viewed at wileyonlinelibrary.com] MULTIDISCIPLINARY RESEARCH IN A UNDERGROUND HISTORICAL QUARRY 851 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License for medieval quarries, was facilitated by the fluvial mean of transport along the Seine. Coevally to the flourishing industrial activity of Caumont, the Duchy of Normandy was founded and expanded during the High and Late Middle Ages (Webber, 2005). The construction of remarkable buildings in Normandy as well as in England required supplying stone material provided by quarries such as Caumont. METHODOLOGY The multidisciplinary methodology combines geomatics and archaeological, geological and geochronological techniques (see Supplementary Data 2—Figure S2.1). Geomatics A 2D topographical survey and two 3D models of Caumont quarry were completed to create a base map of the quarry and to conduct a spatial analysis of the quarry geometry and excavation techniques. Open-cast and underground galleries were surveyed at a 1:200 scale based on 30 fixed stations located at the quarry entrances. Galleries were surveyed using the polyline method, carrying out 1629 stations and 1801 survey shots between stations. Each shot was measured by a calibrated Disto X2 device Trimmis (2018), processing 12,607 items of data in Compass software (Fish, 2001). Finally, the quarry mas was designed in ArcGIS, showing a global error estimated at 1.8 1.5% considering the closing error and length of 109 closed survey polylines. The quarry’s volume was modelled at low and high resolution. The low-resolution 3D model includes the entire excavated galleries, providing a global vision and geometrical parameters defined in Supplementary Data 2—Table S2.1. This model resulted from the 2D survey and was constructed by jointing 1801 cuboids defined between survey stations in Compass (Fish, 2001). The high-resolution 3D model comprises only a part of the Caumont quarry system (Les Maquisards) and was completed to identify more specific techniques such as changing patterns in the exploitation system. Les Maquisards 3D model, forming 24% of the Caumont quarry system, was derived from 198 scanning stations acquired by means of the terrestrial laser scanner (TSL) FARO Focus M 70. Acquired point clouds were filtered, refined and assembled into a single cloud using the Trimble Realwork, and the subsequent closed triangulated model was elaborated at 10 mm precision using 3D Reshaper software. Archaeological prospection Archaeological evidence of the exploitation system in Caumont quarry comprises all the types of uses in an underground quarry, such as excavation structures and side rectangular galleries, toolmarks and unfinished works. All this evidence was represented in the quarry map and integrated in ArcGIS. Geology Geological analysis was conducted to characterize the quarried stone source to identify the ancient quarrying method. These analyses include geological mapping at a 1:1000 scale, elaboration of the stratigraphical section of exploited benches, microscopical analyses, (11 samples) and analyses of rock massif discontinuities (92 fractures and joints). 852 BALLESTEROS ET AL. 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License Geochronology Two speleothems precipitated inside the underground galleries were dated by the 230 Th/ 234 U method to establish a maximum age for the quarry opening, as both speleothems were precipitated after the beginning of the excavations. Seven samples (70–270 mg) were taken respectively along the growth axis (different depths) of Maq speleothem (four samples) and CAU speleothem (three samples) using a micro drill and following the chemical preparation described in Pons-Branchu et al. (2014). U and Th were analysed on the Neptune Plus Plasma multicollector inductively coupled plasma mass spectrometer installed at the LSCE/IPSL (Gif sur Yvette, France). For age correction (of 230 Th from the detrital contamination), two approaches were used: the first one is based on a fixed 230 Th/ 232 Th ratio for the detrital fraction, and the second one is based on the ‘stratigraphical constraint’approach (Hellstrom, 2006). Here, the STRUTage routine (Roy-Barman & Pons-Branchu, 2016) was used for this correction. Quarrying methods The quarrying methods were reconstructed to characterize the underground quarrying developed in Caumont since the medieval period. The combination between the geological data, volume of galleries, excavation geometry and tool marks allowed us to extrapolate the rate and volume of stone production. The excavation of the flinty layers and other beds, as well as other works, generated waste deposits partially used for other applications, such as rubblestone employed for walls and foundations or for lime production (Ballesteros et al., 2021). The volume and production rate of the waste deposits can be also estimated considering the volume of the underground quarry, the stone production rate and a swell (or bulking) factor. The value of the swell factor would be 50% without compacting after waste accumulation in chalk bedrocks (Entwisle et al., 2015). Quarrying concepts and parameters are defined in Supplementary Data 2—Tables S2.1 and S2.2. RESULTS The geometry of the quarry The Caumont quarry system comprises open-cast exploitations and an orthogonal network of 12 km of galleries located 110 m below the plateau surface (Figures 2and 3). According to the 3D modelling, the floor surface of the underground quarry is 212,648 m 2 (Table 1), which 80% correspond to galleries of 12–15 m wide and up to 8 m height. The remaining 20% represents the extension of three open-cast exploitations (Figure 2a). The quarry volume is 1,655,940 m 3 (Table 1). 78% of the volume corresponds to the galleries and 22% to open-cast cuttings. In the galleries, the volume of the excavated rock per meter advanced by the exploitation front (specific volume) is 108 m 3 each. The Caumont quarry is divided in two sectors named A and B (Figure 2; see also quarry pictures in Supplementary Data 2—Figure S2.2). Sector A corresponds to the central and eastern parts of the quarry and includes all the entrances, four of them blocked by rock fall deposits. Sector A comprises galleries of 400 m long and N 110–120E direction, interconnected by smaller galleries of N 10–20E direction. This geometrical configuration generated rectangular pillars of 20–30 m wide and up to 285 m long. Two types of galleries are recognized in sector A: main galleries and contouring galleries. The main galleries correspond to passages of 15 m wide and 8 m height. At the entrances of the quarry, the ceilings and walls of the main galleries are weathered and sometimes enlarged or MULTIDISCIPLINARY RESEARCH IN A UNDERGROUND HISTORICAL QUARRY 853 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License partially closed by rock fall processes. Waste deposits up to 7 m thickness cover the floor. The contouring galleries (e.g., sapes de contournement in French) (Figure 2) present rectangular sections of 0.5 m wide and 2 m height and are in two specific locations. The first is at the upper corners of the main galleries and parallel to the development of these galleries. Parallel contouring galleries are well preserved in the unfinished exploitation fronts as well at the top of the main galleries. The second location is perpendicular to the axes of the main galleries, as shown along the ceiling. Sector B is located at the Western and deepest part of the quarry (Figure 2), hence this sector is younger than sector A. It comprises well-preserved cuboid-like galleries of 12 m wide and 5 m height, displaying exploitation benches at the end. This sector forms a network of cuboidlike galleries (<200 m) with N 100–110E direction, while others are longer, with an N10–20E FIGURE 2 (a) Map of the Caumont quarry showing the open-cast area and the underground sectors A and B, as well as the intercepted karst caves studied by Nehme et al. (2020). The map resulted from the 2D topographical survey of que quarry. (b) Low-resolution 3D model of Caumont underground quarry [Color figure can be viewed at wileyonlinelibrary.com] 854 BALLESTEROS ET AL. 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License direction (Figure 2a). The galleries are interconnected each 20–30 m, forming rectangular unquarried pillars of 10–30 m wide. The ceilings and floors are respectively 1 and 4 m higher than the galleries of sector A. Waste deposits of <2 m thickness cover the floor of sector B. Exploitation benches, toolmarks and groundwater collection system In sector B, the exploitation fronts located at the end of cuboid-like galleries (Figure 2a) comprise four frontal stepped benches, each of 1 m height (exploitation benches are documented in FIGURE 3 (a) West part of the quarry map showing ceiling toolmarks, excavation progress and examples of exploitation phases and corners. (b) Ceiling toolmarks shown by the high-resolution 3D model, indicating the direction of the exploitation in Les Maquisards part. (c) 3D geometry of the galleries. The starting points of sector B are indicated (white dots) in the three sections, the positions of which are shown in Figure 2A [Color figure can be viewed at wileyonlinelibrary.com] MULTIDISCIPLINARY RESEARCH IN A UNDERGROUND HISTORICAL QUARRY 855 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License Supplementary Data 2—Figure S2.2). Note that the stepped benches represent unfinished works just below the sheet flint. Other features such as vertical trenches exploited laterally were sometimes identified. The preserved cuts indicate that the benches were usually exploited from the top to the bottom and from the right to the left. Occasionally, extracted stones of 1 m wide were stored or abandoned inside the quarry and were later covered by precipitated calcite layers. The karst caves (Figure 2; Nehme et al., 2020) discovered during the excavation might have hampered the quarrying activity. Toolmarks were identified in the underground galleries and documented (toolmarks are detailed in Supplementary Data 2—Table S2.3 and Figure S2.3). The walls in sector A preserve some marks caused by iron peaks, especially in the contouring galleries, where homogeneous marks due to chisels are very common. In sector B, the walls and the front of the exploitation benches show marks related to the impact of a lance (iron bars of 1 m long), as described in Sibout (2011). The ceiling of the cuboid-like galleries shows horizontal marks due to a lance. These toolmarks have an asymmetric profile showing a clear direction of the excavations in sector B. The frontal excavation exploited, first, galleries towards the northwest and, second, towards the southwestern and northeastern parts (Figure 3a). As for the lateral excavation pattern, toolmarks are identified in the 3D model and related to lateral excavation of the longitudinal galleries, forming additional small corners (Figure 3b,c). TABLE 1 Geometrical parameters of the Caumont quarry derived from a low-resolution 3D model. Calculations and parameters are detailed in Supplementary Data 2—Table S2.1. The thickness of waste deposits is based on field survey Parameter Units Complete quarry Open-cast quarry Underground quarry Entire Sector A Sector B Type of works –– Open cast works –Main galleries Contouring galleries Cuboid galleries with stairsshaped benches Quarry area m 2 212,648 41,510 171,138 126,818 44,320 Quarry volume m 3 1,655,940 357,650 1,298,290 1,091,069 207,221 Underground galleries Quarry specific volume m 3 m 1 –– 108 133 54 Quarry length m –– 12,024 8,199 3,825 Gallery main orientations Deg. –– N 110–120E N10–20E N 110–120E N10–20E N 100–110E N10–20E Gallery average diameter m–– 10.4 11.7 7.3 Gallery average width m–– 13.5 15.3 11.6 Gallery average height m–– 5.1 7.9 4.6 Gallery ceiling altitude m–– 19 19 20 Gallery floor altitude m –– 12 11 15 Gallery wall surface m 2 –– 505,537 426,089 79,448 Waste deposits inferred thickness m–<15 –<7 <2 856 BALLESTEROS ET AL. 14754754, 2022, 4, Downloaded from https://onlinelibrary.wiley.com/doi/10.1111/arcm.12758 by Universidad De Granada, Wiley Online Library on [03/12/2024]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License Archaeological remains include a water collection system that derived the groundwater of the Robots stream (see Supplementary Data 2—Figure S2.4). The collection system includes a water channel and an aqueduct. The water channel is made of wood with small iron bars. The preserved part of the channel is 155 m long, crossing the quarry galleries and karst caves. The total length of the structure is estimated to be 470 m. The aqueduct is made mainly of two stone walls. Other non-preserved parts would have been made of wood. The water system drained the water from the major cave conduit named Robots stream. Geology Stratigraphy of the quarried bedrock The lower Coniacian chalk limestone, with many hardgrounds, flint nodules and sheet flints, was mainly exploited (a stratigraphical section and microscopical analyses of the quarried bedrock are shown in Supplementary Data 2—Figures S2.5, S2.6 and S2.7). Hardgrounds are reddish or greenish beds, cemented by carbonates, oxides and/or phosphates and, frequently, affected by bioturbation (Mortimore, 2011). Two hardgrounds have regional extension, named Belval and Epivent in Normandy (Hoyez, 2008), and Cliff and Hope hardgrounds in England (Mortimore, 2019). Flint nodules of 2–20 cm in diameter are concentrated in eight stratified beds of 10–20 cm thickness interbedded in the chalk strata. The sheet flint is a continuous layer, usually parallel to the bedding, formed by 2–5cmof the Hope Gap flint (Mortimore, 2019). Hope Gap Sheet flint is located in the upper part of the quarry galleries and is sometimes divided into two sheet flints separated by less than 1m. Caumont chalkstone is a homogeneous white limestone classified as a dedolomitized biomicrite made of 5–40% micrite and comprising nanoscopic fragments of coccoliths, 5–40% of rhombohedral moulds, 5–25% of bioclasts and less than 5% of Mn–Ti–Fe oxides. Rhombohedral moulds are voids of 10–200 μm in size derived from the dissolution of crystals of dolomite formed during diagenesis. Sometimes, the moulds are filled with calcite. Bioclasts are fragments of echinoderms, calcispheres and foraminifers, the abundance of which increases in the upper and lower parts of the exploited strata. Some bioclasts of bryozoans, bivalves and gastropods can be identified under the optical microscope. The combination of historical documents, field survey and petrology enables a correlation between the stratigraphical section and the exploited beds. Stratified flint nodules are separated by 0.4–1 m and mark the limits of the exploited beds. The latter are located below the sheet flint at the top of the galleries. This sheet flint was probably used as a guiding layer during stone extraction since it is located on the ceiling of sector A. Petrophysical and mechanical properties are summarized in Ballesteros et al. (2021). The stone material with the highest mechanical quality corresponds to the Gros Lien bed as a result of its relative high values of hardness, penetration resistance and compression strength. Indeed, the Gros Lien bed shows abundant rhombohedral moulds filled by calcite related to the development of hardgrounds during chalk diagenesis. Consequently, the occurrence of hardgrounds (detailed in Ballesteros et al., 2020) explains the quality of the Caumont chalkstone as a historical construction material. 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