Foto: Jehanne Féblot-Augustins, 2005.
- Ardon
- Le Grangeon 2
- St-André (Neuville-sur-Ain)
- Chatanay
- Villes-En Lachat
- Sous-Sac
Sampled sites:
| Material name: | Ht3 |
| Synonyms: | N/A |
| Material (geologic): | Late Hauterivian (Early Cretaceous) flint |
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Foto: Jehanne Féblot-Augustins, 2005. |
Sampled sites:
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| Mode of occurrence: | Occurring in primary context as continuous beds 7 to 8 cm thick; in secondary context as angular fragments or, exceptionally, as water-worn cobbles (Neuville/St André). |
| Cortex: | Aspect varies depending provenances (fresh and rough, worn, or alluvial neo-cortex); grey to ochre hues, max. thickness 1.5 cm, transition gradual, to sharp in water-worn cobbles |
| Colour: | Light grey to yellowish brown layers (10YR 6.5/1 to 6.5/3, 10YR 5/1 to 5/3-4). |
| Pattern: | Distinctly laminated with parallel or cross bedding, layers 2 to 3 mm thick or more, but <1 cm. |
| Appearance: | Homogeneous material, dull and opaque, a little rough, medium to fine-grained. |
| Structure: | Laminated, corresponding to differences in both colour and texture, layers more or less densely packed with elements stained by iron oxides alternating with layers of chalcedony; fluidal arrangement of grains. |
| Texture: | Wackestone to packstone depending on the layers. |
| Matrix: | Milky to translucent. |
| Grains: | 25 to 60 %, pale yellow or orangey yellow, very rounded with high to low sphericity or irregularly shaped, highly micritized; poorly sorted, ranging from 100 to 600 µ for high sphecicity grains, to 2 mm for low sphericity grains. |
| Grain composition: | Serpulids, thick-walled sponge spicules, entrochi, rare foraminifera (Textularidae), a gastropod larva, bryozoans (?); numerous peloids, ooliths (often micritized, iron oxides). |
| Further information: | Click here for the original French description (opens in a new window), or here for more information on the attributes used in the description (use your browser's "BACK"-button to return here). |
| Citing: | Information on citing this page can be found here. |
| Locality: | Châtillon-en-Michaille / Ardon , France, Ain department |
| Synonyms: | Sampling site Bugey 43 after Féblot-Augustins |
| Geographical description: | The sample originates from a steep, wooded slope, just SW of the village/hamlet of Ardon, a kilometre to the south-west of Châtillon-en-Michaille. |
| Geographical co-ordinates: |
east/x 866,5 north/y 2132 (Lambert zone II, NTF)
This corresponds to |
| Co-ordinate precision: |
The coordinates given were taken from a large-scale map, and are within approx. 50 metres of the actual spot. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level, so don't be deceived by the apparently high precision to the second. The location can be found on the 1:25 000 topographical map sheet 3329 W of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate consists of sediments of Late Hauterivian age, belonging to unit n3. Map of all sampled localities of Early Cretaceous flint in the Bugey (PDF, 300 KB, opens in new window). |
| Type of source: | Primary. |
| Other types of flint: | This primary source doesn't yield any other type of flint but the Ht3-type. |
hi.jpg&w=771&h=585&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (101 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
hi.jpg&w=609&h=600&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (53 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Arbignieu / Thoys - Le Grangeon 2, France, Ain department |
| Synonyms: | Sampling site Bugey 45 after Féblot-Augustins |
| Geographical description: | The material was collected from a very low eroded cliff along a forest path parallel to the D 10d road, joining Arbignieu to Thoys, approx. 3km SW of Belley. |
| Geographical co-ordinates: |
east/x 857,2 north/y 2087,1 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The coordinates given were taken from a large-scale map, and are within approx. 50 metres of the actual spot. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level, so don't be deceived by the apparently high precision to the second. The location can be found on the 1:25 000 topographical map sheet 3231 E of the French Institut Géographique National. |
| Geology: |
The geological map classifies the substrate as sediments of Early Cretaceous/Hauterivian age, marked as unit n3. Map of all sampled localities of Early Cretaceous flint in the Bugey (PDF, 300 KB, opens in new window). |
| Type of source: | Primary. |
| Other types of flint: | All material in this location can be classified as Ht3-flint. |
hi.jpg&w=646&h=595&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (78 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Neuville-sur-Ain / St-André, France, Ain department |
| Synonyms: | Sampling site Bugey 47 after Féblot-Augustins |
| Geographical description: | The material was collected near a slight rise within a large bend of the river "le Suran", just to the NW of St. André, some five kilometres west of Poncin. |
| Geographical co-ordinates: |
east/x 832,5 north/y 2124,8 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The coordinates given were taken from a large-scale map, and are within approx. 50 metres of the actual spot. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level, so don't be deceived by the apparently high precision to the second. The location can be found on the 1:25 000 topographical map sheet 3129 E of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate belongs to unit RQ (P1), which consists of residual fluviatile deposits (attributed to the Late Pliocene) with quartzite — and more seldom flint — cobbles. Map of all sampled localities (secondary and primary) of Early Cretaceous flint in the Bugey (PDF, 300 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | Apart from the Ht3-flint described here, also several other flint-types can be found here, all of Senonian age, like CN2a, CN2c, CN3a, CN3b, and CN4c |
hi.jpg&w=950&h=550&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (100 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Poncin / Chenavel - Chatanay, France, Ain department |
| Synonyms: | Sampling site Bugey 48 after Féblot-Augustins |
| Geographical description: | The sampling-site is located directly adjacent to a narrow road, a bit over a kilometre to the (S)SW of Poncin. |
| Geographical co-ordinates: |
east/x 836,7 to 836,8 north/y 2124 to 2124,2 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
As the site is a few hectares in size, precision is not of the highest importance, but the coordinates lie well within the area. The geographical coordinates point to a spot near the centre of the site. The location can be found on the 1:25 000 topographical map sheet 3230 W of the French Institut Géographique National. |
| Geology: |
The material from this site can be classified as surface-collected flint or in eroded gulleys, Chenavel sector, clays-with-flint of various geological origins (Early and Late Cretaceous); Unit S (Rs). Map of all sampled localities of Early Cretaceous flint in the Bugey (PDF, 300 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | Besides the Early Cretaceous Ht3 flint, several types of Late Cretaceous material can be found here (CN1a, CN2a, CN2c, CN4a, CN4b, and CN6). |
hi.jpg&w=890&h=585&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (127 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
hi.jpg&w=672&h=590&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (77 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
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hi.jpg&w=658&h=590&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (97 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Villes / En Lachat, France, Ain department |
| Synonyms: | Sampling site Bugey 49 after Féblot-Augustins |
| Geographical description: | The source is located in some fields, under a kilometre away in a northwesterly direction from the hamlet/village of Villes, some eight kilometres SW of Bellegarde-sur-Valserine. |
| Geographical co-ordinates: |
east/x 866,3 north/y 2127,5 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The coordinates given were taken from a large-scale map, and are within approx. 50 metres of the actual spot. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level; the 1-second precision is given to prevent any rounding-errors. The location can be found on the 1:25 000 topographical map sheet 3329 W of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate belongs to the Early to Middle Miocene (without distinction between Burdigalian and Helvetian), unit m1b-2a. Map of all sampled localities of Early Cretaceous flint in the Bugey (PDF, 300 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | The flint here constitutes quite a mixed lot, with predominantly Late Cretaceous material like CE1a, CE1b, CE1c, CE2, CE3, CE4a, CE4b, and CE5 |
hi.jpg&w=728&h=590&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (89 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Injoux-Génissiat / Sous-Sac , France, Ain department |
| Synonyms: | Sampling site Bugey 50 after Féblot-Augustins |
| Geographical description: | The source is located in a wooded valley with an intermittent stream near the Grotte des Huguenots, about half-way between the villages of Craz and Lhôpital, roughly eight kilometres south-southwest of Bellegarde-sur-Valserine. |
| Geographical co-ordinates: |
east/x 866 north/y 2120,3 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The Lambert-coordinates above were read off a large-scale map, and are within approx. 50 metres of the actual spot. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level, so don't be deceived by the apparently high precision to the second. The location can be found on the 1:25 000 topographical map sheet 3330 W of the French Institut Géographique National. |
| Geology: |
The sample was collected from the surface where the local gological map indicates sediments of Barrmo-Aptian of Urgoninian facies (unit n4-5), although the flint itself is most likely of Hauterivian age. Map of all sampled localities of Early Cretaceous flint in the Bugey (PDF, 300 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | At this site also another flint-type from the Hauterivian can be found, namely the Ht2 material |
hi.jpg&w=950&h=462&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (121 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Last modified on: November 15, 2005 |
Contents primarily by: Jehanne Féblot-Augustins |
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