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CE1c

Material name:	CE1c
Synonyms:	Silex Crétacé supérieur Est - Sénonien (Campanien)
Material (geologic):	Campanian (Senonian/Late Cretaceous) flint

Foto: Jehanne Féblot-Augustins, 2005.

Sampled sites:

Villes-En Lachat

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Material description

Mode of occurrence: Ovoid pebbles and cobbles.

Cortex: Rolled neo-cortex, smooth and thin (<1 mm), grey, transition sharp.

Colour: Grey (N5) with indistinct darker grey or light tan patches.

Pattern: Basically featureless, a few specks and spots.

Appearance: Homogeneous material, dull and opaque, moderately smooth and quite dry, medium-grained.

Structure: No particular structure.

Texture: Wackestone.

Matrix: Milky.

Grains: 20 %, pale, micritized, high sphericity, contained between 100 and 500 µ.

Grain composition: Numerous globose planktonic foraminifera (e.g. Hedbergella sp. of 500 µ), whole or fragmented (discrete chambers of 100-120 µ), very rare biserial Heterohelicidae, a Lenticulinea, a few thick-walled monaxon sponge spicules.

Microphotograph of Globotruncanidae
Globotruncanidae (Hedbergella sp.)
in CE1c flint

Photo: A. Arnaud Vanneau,
(Laboratoire de Géodynamique des Chaînes Alpines, Grenoble)

Determination: M. Caron, Université de Fribourg.

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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Villes-En Lachat

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 Lat. 46° 05' 43" N Long. 005° 46' 53" 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; 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 Late Cretaceous flint in the Bugey (PDF, 54 KB, opens in new window).
Type of source:	Secondary. Redeposited Campanian flint from Miocene sediments.
Other types of flint:	The flint here constitutes quite a mixed lot, with predominantly Late Cretaceous material like CE1a, CE1b, CE2, CE3, CE4a, CE4b, and CE5, but also Hauterivian (Early Cretaceous) material of the Ht3-type.

Foto: Jehanne Féblot-Augustins, 2005

Foto: Jehanne Féblot-Augustins, 2005

Last modified on:
November 15, 2005

Contents primarily by:
Jehanne Féblot-Augustins

Comments to:

Mode of occurrence:	Ovoid pebbles and cobbles.
Cortex:	Rolled neo-cortex, smooth and thin (<1 mm), grey, transition sharp.
Colour:	Grey (N5) with indistinct darker grey or light tan patches.
Pattern:	Basically featureless, a few specks and spots.
Appearance:	Homogeneous material, dull and opaque, moderately smooth and quite dry, medium-grained.
Structure:	No particular structure.
Texture:	Wackestone.
Matrix:	Milky.
Grains:	20 %, pale, micritized, high sphericity, contained between 100 and 500 µ.
Grain composition:	Numerous globose planktonic foraminifera (e.g. Hedbergella sp. of 500 µ), whole or fragmented (discrete chambers of 100-120 µ), very rare biserial Heterohelicidae, a Lenticulinea, a few thick-walled monaxon sponge spicules.

	Globotruncanidae (Hedbergella sp.) in CE1c flint
	Photo: A. Arnaud Vanneau, (Laboratoire de Géodynamique des Chaînes Alpines, Grenoble) Determination: M. Caron, Université de Fribourg.

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.