|Synonyms:||Silex Crétacé supérieur Centre - Sénonien.|
|Material (geologic):||Late Cretaceous (Senonian) flint.|
Foto: Jehanne Féblot-Augustins, 2005.
|Mode of occurrence:||Small nodules and fragments of tabular flint.|
|Cortex:||Worn, thin (<1 mm), pitted, stained black; transition sharp, pale concentric banding (2 mm) immediately below the cortex (migration of sponge spicules).|
|Colour:||Yellowish brown (10YR 5/3.5).|
|Pattern:||Featureless (very rare white spots corresponding to concentrations of thin-walled sponge spicules).|
|Appearance:||Very homogeneous material with a greasy lustre, subtranslucent, very smooth, very fine-grained.|
|Structure:||Grains very regularly distributed.|
|Grains:||7.5 to 10 %, pale skeletal grains and carbonaceous matter, subangular to rounded with high sphericity, regularly distributed and contained between 80 and 100 µ.|
|Grain composition:||Rare small globose and biserial (Textularidae) planktonic foraminifera, thin-walled sponge spicules; abundant carbonaceous elements, some iron oxides and detrital 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.|
|Locality:||Andert-et-Condon / Andert - Les Côtes, France, Ain department|
|Synonyms:||Sampling site Bugey 52 after Féblot-Augustins|
(Lambert zone II, NTF)
This corresponds roughly with
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.
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 CC3b flint, quite a lot of other Late Cretaceous (Senonian) flints can be found here, CC2, CC3a, CC4a, CC4b as well as Early Cretaceous (Urgonian) material of the Ur-type|
Foto: Jehanne Féblot-Augustins, 2005
|Last modified on:
November 15, 2005
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