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Bj1

Material name: Bj1
Synonyms: N/A
Material (geologic): Middle Jurassic (Early to Middle Bajocian) chert

Detail of Bj1 flint
Foto: Jehanne Féblot-Augustins, 2005

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Material description

Mode of occurrence: Ovoid nodules, occasionally set very close together and forming thin bands 4 to 7 cm thick.
Cortex: Rough, pale tan to very light yellowish grey, 0.5 to 1.5 cm thick, transition to core sharp.
Colour: Dark to medium grey (N4 to N6).
Pattern: Featureless or occasionally slightly splotched to mottled.
Appearance: Homogeneous material, although often jointed and tectonised, dull and opaque, moderately smooth and rather fine-grained.
Structure: Very finely laminated, with a fluidal arrangement of grains.
Texture: Wackestone
Matrix: Opaque and grey, with fine alternating bands of darker and lighter tones.
Grains: 20 to 40 % according to sample analysed, light in colour, subangular to rounded with low sphericity, ranging in size between 80 and 170 µ, very occasionally 500 µ.
Grain composition: Numerous pellets, fine sponge spicule debris, echinoderms, pelecypod fragments; iron oxides, quartz.
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.


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Gardon 1
Locality: Ambérieu-en-Bugey / Les Balmeaux - Gardon 1, France, Ain department
Synonyms: Sampling site Bugey 1 after Féblot-Augustins.
Geographical description: The sample was collected at the foot of a steep slope, approx. 1.5 kilometre east of the hamlet of Vareille, which is located just to the east of the town of Amberieu-en-Bugey.
Geographical co-ordinates: east/x 836.45
north/y 2110.8
(Lambert zone II, NTF)

This corresponds roughly with
Lat. 45° 57' 22" N
Long. 005° 23' 14" E
(WGS84)

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 3130 E of the French Institut Géographique National.

Geology: According to the geological map, the substrate belongs to unit J1a-b, Early Aalenian to Early-Middle Bajocian (Middle Jurassic).

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 location doesn't yield any other types of flint apart from Bj1.
  Example
Foto: Jehanne Féblot-Augustins, 2005
 
Example
Foto: Jehanne Féblot-Augustins, 2005
 


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Gardon 2
Locality: Ambérieu-en-Bugey / Les Balmeaux - Gardon 2, France, Ain department
Synonyms: Sampling site Bugey 2 after Féblot-Augustins
Geographical description: The source is located at the foot of a steep slope, approx. 1.5 kilometre east of the hamlet of Vareille, which is located just to the east of the town of Amberieu-en-Bugey, some 100 metres north of the sampling site Gardon 1. For a more precise explanation of the local situation, see the description under Bt4.
Geographical co-ordinates: east/x 836.45
north/y 2110.9
(Lambert zone II, NTF)

This corresponds roughly with
Lat. 45° 57' 25" N
Long. 005° 23' 15" E
(WGS84)

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 3130 E of the French Institut Géographique National.

Geology: On the geological map, the parent rock is classified as J1a-b, Early Aalenian to Early-Middle Bajocian (Middle Jurassic).

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.
  Example
Foto: Jehanne Féblot-Augustins, 2005
 
 

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Le Maupas
Locality: Ambérieu-en-Bugey / Vareille - Le Maupas 1, France, Ain department
Synonyms: Sampling site Bugey 3 after Féblot-Augustins
Geographical description: The source is located next to a marked footpath (Grande Randonné 59) leading from Vareille/Ambérieu-en-Bugey to Mont Luisandre/Les Allymes in the Bois d'Ambérieu.
Geographical co-ordinates: east/x 836.65
north/y 2110.3
(Lambert zone II, NTF)

This corresponds roughly with
Lat. 45° 57' 06" N
Long. 005° 23' 23" E
(WGS84)

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 3130 E of the French Institut Géographique National.

Geology: According to the geological map, the substrate belongs to unit J1a-b, Early Aalenian to Early-Middle Bajocian (Middle Jurassic).

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 in this source belongs to type Bj1.
  Example
Foto: Jehanne Féblot-Augustins, 2005
 
 


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Croix des Moines
Locality: Torcieu / Croix des Moines, France, Ain department
Synonyms: Sampling site Bugey 6 after Féblot-Augustins
Geographical description: The sample comes from a ridge overlooking the prominent bend in the Albarine near Torcieu, approx. 5 km southeast of Ambérieu-en-Bugey.
Geographical co-ordinates: east/x 837.5
north/y 2107.7
(Lambert zone II, NTF)

This corresponds roughly with
Lat. 45° 55' 41" N
Long. 005° 23' 58" E
(WGS84)

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 3230 W of the French Institut Géographique National.

Geology: On the geological map, the source is located on 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 in this source belongs to type Bj1.
  Example
Foto: Jehanne Féblot-Augustins, 2005
 
Example
Foto: Jehanne Féblot-Augustins, 2005
 

 

Last modified on:
November 15, 2005
Contents primarily by:
Jehanne Féblot-Augustins
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