Foto: Jehanne Féblot-Augustins, 2005.
| Material name: | Bj3 |
| Synonyms: | N/A |
| Material (geologic): | Middle Jurassic (Dogger, Early to Middle Bajocian) flint |
|
Foto: Jehanne Féblot-Augustins, 2005. |
| Mode of occurrence: | Large individual ovoid nodules, small joining nodules forming beds 5 to 6 cm thick. |
| Cortex: | Rough, light yellowish tan, 0.5 to1.5 cm thick, transition sharp to more gradual. |
| Colour: | Light brownish grey (10YR 6/1 to 7/2). |
| Pattern: | Featureless or faintly laminated. |
| Appearance: | Homogeneous material, dull and opaque, slightly to very rough (Prémeyzel), medium-grained. |
| Structure: | Laminated, either quite distinctly and corresponding to differences in texture (La Combe), or more faintly; micro-vugs lined with quartz. |
| Texture: | Wackestone to packstone. |
| Matrix: | Opaque to milky white. |
| Grains: | 30 to 50 %, white, pale yellow, rounded with high sphericity, well sorted, 50 to 100 µ (Chenevières), 100 to 200 µ (La Combe, Prémeyzel) |
| Grain composition: | Pellets numerous (La Combe) to rare, microfilaments (Posidonomya test sections), sections of serpulids, sponge spicules, numerous foraminifera (Nodosarianidea, Miliolidea) often occurring as black "ghosts" outlined by impurities; 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: | Ambérieu-en-Bugey / Les Allymes - Chenevières 1, France, Ain department |
| Synonyms: | Sampling site Bugey 5 after Féblot-Augustins |
| Geographical description: | The sampling site is located towards the top of a wooded slope, approx. 500 metres south of the hamlet Les Allymes, which lies a bit over three kilometres east-northeast of Ambérieu-en-Bugey. |
| Geographical co-ordinates: |
east/x 837.8 north/y 2112 (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 to 100 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 3230 W of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate belongs to unit l9b-J1b (Early Aalenian and Early-Middle Bajocian). Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Primary. |
| Other types of flint: | All flint from this site is classified as Bj3. |
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| Locality: | Jujurieux / La Combe, France, Ain department |
| Synonyms: | Sampling site Bugey 8 after Féblot-Augustins |
| Geographical description: | The samples were collected at the head of a small valley near the local road that connects the hamlets of Cuquen and Chaux, directly to the northeast of Jujurieux |
| Geographical co-ordinates: |
east/x 839.2 north/y 2120.7 (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 have the same accuracy. To prevent the introduction of more imprecision by rounding, the transformation of the precise Lambert-coordinates. The location can be found on the 1:25 000 topographical map sheet 3230 W of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate belongs to unit l9b-J1b (Early Aalenian and Early-Middle Bajocian). Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Primary. |
| Other types of flint: | This locality doesn't yield any other flint types. |
hi.jpg&w=574&h=580&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (65 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
hi.jpg&w=950&h=568&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (95 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Prémeyzel / route du col, France, Ain department |
| Synonyms: | Sampling site Bugey 9 after Féblot-Augustins |
| Geographical description: | N/A |
| Geographical co-ordinates: |
east/x 857.5 north/y 2081.2 (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 location can be found on the 1:25 000 topographical map sheet 3232 E of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate belongs to unit J1a-b (Early Aalenian and Early-Middle Bajocian). Map of all sampled localities of bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Primary. |
| Other types of flint: | None. |
hi.jpg&w=950&h=547&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (128 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Journans / chemin de Rignat, France, Ain department |
| Synonyms: | Sampling site Bugey 10 after Féblot-Augustins |
| Geographical description: | The sample was collected on a wooded hill directly to the east-southeast of Journans, a hamlet on the western fringe of the Bugey, 10 kilometres SW of Bourg-en-Bresse. |
| Geographical co-ordinates: |
east/x 831.8 north/y 2131.5 (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, 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 Rs clays-with-flint resulting from the decalcification of Bajocian and Bathonian flint bearing formations in this case unit J1a-b, Early-Middle Bajocian. Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | Although it is a secondary source, all material belongs to the Bajocian type Bj3. |
hi.jpg&w=950&h=406&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (98 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Saint-Alban / Boches, France, Ain department |
| Synonyms: | Sampling site Bugey 11 after Féblot-Augustins |
| Geographical description: | The site is a small wooded valley directly to the east of the hamlet Boches, which is located half-way between the villages of Poncin and Cerdon. |
| Geographical co-ordinates: |
east/x 840 - 841 north/y 2124.5 - 5125.3 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The sampling area is quite extended, so these coordinates, taken off a large scale map, will be good enough to get you near the source The latitude/longitude coordinates are a direct transformation of the approximate centre of the area. The location can be found on the 1:25 000 topographical map sheet 3229 W of the French Institut Géographique National. |
| Geology: |
According to the geological map, the substrate belongs to the unit Rs, these clays-with-flints are residual loams from the weathering of Early to Middle Bajocian limestones containing flint. Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | All flint in this locality is of the Bj3-type. |
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| Locality: | Ambérieu-en-Bugey / St-Germain - Thévenaz (source), France, Ain department |
| Synonyms: | Sampling site Bugey 12 after Féblot-Augustins |
| Geographical description: | N/A |
| Geographical co-ordinates: |
east/x 836 north/y 2110.4 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The coordinates given were taken from a large-scale map, and are probably within approx. 100 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 3130 E of the French Institut Géographique National. |
| Geology: |
The material comes from clay-with-flints (unit Rs on the geological map), but belongs originally to Bajocian limestones (unit J1). Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | This site yields no other flint-types. |
hi.jpg&w=790&h=610&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (140 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Ambronay / Merland - Pierrefeu 2, France, Ain department |
| Synonyms: | Sampling site Bugey 13 after Féblot-Augustins |
| Geographical description: | The sample was taken on a low wooded ridge, half a kilometre to the southeast of the hamlet Merland, which lies two kilometres east of Ambronay. |
| Geographical co-ordinates: |
east/x 836.6 north/y 2115.8 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
The coordinates will get you within 50-100 metres from the actual spot, as they were taken off a large-scale topographic map. The same goes for the Lat/Long coords, which are a precise transformation of the Lambert-coordinates that are given above. The location can be found on the 1:25 000 topographical map sheet 3130 E of the French Institut Géographique National. |
| Geology: |
The material comes from a residual clay-with-flints (unit Rs on the geological map), which was formed by the weathering of Bajocian limestones (unit J1). Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | None. |
hi.jpg&w=760&h=550&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (87 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Locality: | Ambérieu-en-Bugey / Vareille - Le Plan, France, Ain department |
| Synonyms: | Sampling site Bugey 14 after Féblot-Augustins |
| Geographical description: | The source lies on a hilltop approx. 1 kilometre east of the hamlet St. Germain, a couple of kilometres southeast of Ambérieu-en-Bugey. |
| Geographical co-ordinates: |
east/x 836.4 north/y 2110 (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 - 100 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 3130 E of the French Institut Géographique National. |
| Geology: |
The underground at the sampling-site is a clay-with-flints which resulted from the decalcification of several flint-bearing formations dating to the Bajocian and Bathonian (units J1a-b and J1c from the Bajocian and J2 from the Bathonian). Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | Besides type Bj3, this residual source also yields Late Bajocian flints of the Bj4c variety, as well as Bathonian flints of the types Bt1, Bt4 and Bt. |
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| Locality: | Nivollet-Montgriffon / Pré Rappet, France, Ain department |
| Synonyms: | Sampling site Bugey 15 after Féblot-Augustins |
| Geographical description: | The sampling site is located between the mountain Mont Luisandre and Nivollet-Montgriffon, at the side of the local road which runs south of l'Abergement-de-Varey, ultimately towards St-Rambert-en-Bugey. |
| Geographical co-ordinates: |
east/x 839.8 north/y 2114.1 (Lambert zone II, NTF)
This corresponds roughly with |
| Co-ordinate precision: |
As the coordinates given were taken off a large-scale map they are probably within 50-100 metres from the actual location where the sample was collected. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level, again within approx. 100 metres. The location can be found on the 1:25 000 topographical map sheet 3230 W of the French Institut Géographique National. |
| Geology: |
According to the geological map, the sample originates from clay-with-flint, which were left over as the original Bajocian parent rock (unit J1), was dissolved. Map of all sampled localities of Bajocian flint in the Bugey (PDF, 190 KB, opens in new window). |
| Type of source: | Secondary. |
| Other types of flint: | All material from this sites belongs to type Bj3. |
hi.jpg&w=733&h=610&i=Foto: Jehanne Féblot-Augustins, 2005. "Click for a high-res version (148 Kbytes)") Foto: Jehanne Féblot-Augustins, 2005 |
| Last modified on: November 15, 2005 |
Contents primarily by: Jehanne Féblot-Augustins |
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