Angoumian
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The Angoumian is a geological group restricted to the northern Aquitaine Basin in France. The group consists of two fossiliferous limestone formations deposited during the Turonian.
Simplified stratigraphy of the Angoumian
A rudist biostrome in the Angoulême Formation; Aucors quarry near Beaussac, Dordogne
Stylolite
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Stylolites are serrated surfaces within a rock mass at which mineral material has been removed by pressure dissolution, in a deformation process that decreases the total volume of rock. Minerals which
Angoumian
…show a horizontal movement direction pointing to the SSE, rarely to the SE. There is also a fairly common occurrence of slickolites (a special kind of stylolite), which indicate the direction of pressure solution in the rock. This direction is mostly vertical, i.e. merely representing the overburden of the…
Stylolites in limestone
A stylolite viewed in thin section in plane polarized light in a packstone, Oehrlikalk formation of the Axen nappe, Wellenberg, Switzerland
Stylolite in a Slovakian limestone
Stylolites affecting deformed coral limestone from Devon, England