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CN8c

Material name:	CN8c
Synonyms:	N/A
Material (geologic):	Late Cretaceous (Senonian, Campanian) flint

Foto: Jehanne Féblot-Augustins, 2005.

Sampled sites:

Breignes-Pierre-Feu 2

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Material description

Mode of occurrence: A single fist-sized regular nodule.

Cortex: Thin, smooth and worn, transition sharp.

Colour: Brownish yellow (10YR 6.5/6).

Pattern: Featureless.

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

Structure: Distinctly fluidal arrangement of grains.

Texture: Wackestone.

Matrix: Subtranslucent.

Grains: 25 %, pale, rounded with high to low sphericity or irregularly shaped, poorly sorted (mean size 100 µ, foraminifera of 250 µ, long spicules of 1000 µ).

Grain composition: Mainly long monaxon thin-walled sponge spicules, some globose planktonic foraminifera, bryozoan fragments (?).

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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Breignes-Pierre-Feu 2

Locality:	Poncin / Breignes - Pierre-Feu 2, France, Ain department
Synonyms:	Sampling site Bugey 34 after Féblot-Augustins
Geographical description:	The source is located near a narrow road/path on a slight rise between the hamlets of Chenavel and Breignes, a bit over half a kilometre to the west of the latter, and somewhat more than 2 kilometres SSE of Poncin.
Geographical co-ordinates:	east/x 838.2 north/y 2122.9 (Lambert zone II, NTF) This corresponds with Lat. 46° 03' 52" N Long. 005° 24' 58" E (WGS84)
Co-ordinate precision:	The Lambert-coordinates given were read from a detailed topographical map, and are within 50 metres of the precise location. The latitude/longitude coordinates are a direct transformation of these data on WGS84 and have the same accuracy. They are given to the apparent high accuracy to prevent the introduction of a rounding-error. The location can be found on the 1:25 000 topographical map sheet 3230 W of the French Institut Géographique National.
Geology:	The embedding materials are, according to the geological map, Late Miocene (Tortonian) continental sediments, belonging to the stratigraphic unit m2bC. The reworked flint of the CN8c-type originates from Late Cretaceous (Campanian) limestones. 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:	Apart from the singular CN8c-type, other Late Cretaceous flints of the types CN1a and CN2a can be found here, as well as the Middle Jurassic Bt material and Early Cretaceous Ht1 flint.

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:	A single fist-sized regular nodule.
Cortex:	Thin, smooth and worn, transition sharp.
Colour:	Brownish yellow (10YR 6.5/6).
Pattern:	Featureless.
Appearance:	Homogeneous material, dull and opaque, dry, quite rough, medium-grained.
Structure:	Distinctly fluidal arrangement of grains.
Texture:	Wackestone.
Matrix:	Subtranslucent.
Grains:	25 %, pale, rounded with high to low sphericity or irregularly shaped, poorly sorted (mean size 100 µ, foraminifera of 250 µ, long spicules of 1000 µ).
Grain composition:	Mainly long monaxon thin-walled sponge spicules, some globose planktonic foraminifera, bryozoan fragments (?).
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.