Age: Lower part of the Campanian (80 My.)
Thickness: 50 to 100 metres
Description of the unit:
It is a siliceous homogeneous formation. The base of the unit is
a fine sandstone, highly bioturbated
with nice plane and parallel laminations.
Above appear some channel structures
and other erosive features with normally graded
beds or cross bedding. Some fine
and dark clay layers rich in organic
constituents may be associated with tidal structures. These dark clays
are most of the time observed reworked in soft pebbles at the base of the
erosive structures. Most of the formation is of fluvial origin, but there
is a shallow marine influence at the base.
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