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Material name: CC3a
Synonyms: Silex de Crétacé supérieur Centre - Sénonien
Material (geologic): Late Cretaceous (Senonian) flint.

Detail of CC3a-flint
Foto: Jehanne Féblot-Augustins, 2005.

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Material description

Mode of occurrence: Small nodules and fragments of tabular flint.
Cortex: 5 mm thick, worn, rough and pitted, reddish yellow, transition sharp and marked by a thin brown line (iron oxides); pale thin concentric banding immediately below the cortex due to the outward migration of large quantities of sponge spicules.
Colour: Reddish brown (7.5YR 4.5/2).
Pattern: Featureless (rare 5 mm patches of unreplaced matrix, 1 to 2 mm concentrations of skeletal grains and carbonaceous matter).
Appearance: Very homogeneous material with a shiny to medium lustre, subtranslucent, smooth, fine-grained.
Structure: Grains regularly distributed.
Texture: Mudstone, to very locally wackestone.
Matrix: Subtranslucent to milky.
Grains: 5 to 7.5 % (locally 15 %), skeletal grains and carbonaceous matter, pale-coloured or stained by iron oxides, subangular to rounded with high sphericity, regularly distributed and contained between 50 and 125 µ; fuzzy irregularly shaped elements of 250 µ.
Grain composition: Rare very small globose and biserial planktonic foraminifera, benthic foraminifera (Nodosaria sp.), thin-walled sponge spicules, bryozoan fragments (?); abundant carbonaceous elements, frequent 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.

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Les Côtes
Locality: Andert-et-Condon / Andert - Les Côtes, France, Ain department
Synonyms: Sampling site Bugey 52 after Féblot-Augustins
Geographical description: N/A
Geographical co-ordinates: east/x 858,4
north/y 2092,2
(Lambert zone II, NTF)

This corresponds roughly with
Lat. 45° 46' 51" N
Long. 005° 39' 36" E

Co-ordinate precision: The coordinates given were taken from a large-scale map, and won't be off by more than 50 metres.
The latitude/longitude coordinates are a direct transformation of these data on WGS84 and are accurate to the same level, so give or take an arc-second or two.

The location can be found on the 1:25 000 topographical map sheet 3231 E of the French Institut Géographique National.

Geology: According to the geological map, the substrate is of Oligocene age (unit 'g'). The flint istself originates in Late Cretaceous (Senonian) sediments and lies here in a secondary position.

Map of all sampled localities of Late Cretaceous flint in the Bugey (PDF, 54 KB, opens in new window).

Type of source: Secondary.
Other types of flint: Apart from the CC3a flint, quite a lot of other Late Cretaceous (Senonian) flints can be found here, CC2, CC3b, CC4a, CC4b as well as Early Cretaceous (Urgonian) material of the Ur-type
  Fractured Late Cretaceous flint
Foto: Jehanne Féblot-Augustins, 2005
Typical CC3a flint
Foto: Jehanne Féblot-Augustins, 2005


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