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Material name: T2
Synonyms: Tertiary Freshwater chert; Silex Lacustre
Material (geologic): Cenozoic (Tertiary) flint

Closeup of tertiary flint
Foto: Jehanne Féblot-Augustins, 2005.

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Material description

Mode of occurrence: Small flattish nodule
Cortex: Worn, quite smooth, 1 to 5 mm thick, initially white but superficially stained brown by the enclosing clay, transition sharp but irregular.
Colour: Dark purplish grey (5YR 4/1 to 5/1).
Pattern: Very faintly mottled.
Appearance: Material highly affected by epigenesis, homogeneous with a shiny lustre, translucent in thin flakes, smooth and fine-grained.
Structure: No particular structure.
Texture: Mudstone.
Matrix: Very milky.
Grains: 5 %, barely discernible ("digested"), spherical or ovate, contained between 250 and 500 µ.
Grain composition: Most probably oogons.
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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Sous Chenavel
Locality: Jujurieux / Chenavel - Sous Chenavel, France, Ain department
Synonyms: Sampling site Bugey 72 after Féblot-Augustins
Geographical description: The site lies on a slightly wooded, westfacing slope, overlooking the Ain river and the N 84 road, 1 kilometre NNW of the hamlet of Chenavel, and four kilometres NE of Pont-d'Ain.
Geographical co-ordinates: east/x 835,8
north/y 2123,9
(Lambert zone II, NTF)

This corresponds with
Lat. 46° 04' 27" N
Long. 005° 23' 08" E

Co-ordinate precision: The coordinates given were taken from a large-scale map, and are within 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, i.e. take or leave an arc-second or two.

The location can be found on the 1:25 000 topographical map sheet 3130 E of the French Institut Géographique National.

Geology: As the material was collected from the surface, there is no clear association with any geologic strata. Based on the structure and inclusions, it may be safely assumed, the flint is of Tertiary age (c.f. the material from Etrelles, and some more information on the typical fossils can be found on the page on the tertiary flint from Rhomigny-Lhéry).

Map of all sampled localities of Cenozoic flint in the Bugey (PDF, 40 KB, opens in new window).

Type of source: Secondary.
Other types of flint: No other flint is known from this locality.
  Rolled nodule of Cenozoic flint
Foto: Jehanne Féblot-Augustins, 2005
Flake of Tretiary flint
Foto: Jehanne Féblot-Augustins, 2005


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