Wednesday, January 19, 2011

Geology on 35mm film #2 - Soft sediment deformation


©RomaniaRocks
Soft sediment deformation in the form of a small compressional fold, in the
Olanesti Formation (Eocene). Note the undeformed strata above and below
the fold.  The outcrop is located in a road cut, east of the Olt river.

Good examples of soft sediment deformation structures exist in the Eocene section of the Getic Basin in Romania.  The photographs give some examples of reverse faults and small compressional folds found in road-cut outcrops to the east of the Olt River.

These features most likely formed in a pro-delta environment, characterized by high sedimentation rates and relatively steep slopes.  Because of the high sedimentation rates, water did not expel easily from the recently deposited sediment.  This resulted in increased pore pressure immediately after deposition, which lead to displacement and movement of unconsolidated sediment.

©RomaniaRocks
Soft sediment deformation in the form of a small compressional fold.
The strata are Eocene in age and the outcrop is located east of the Olt river.
©RomaniaRocks
Soft sediment deformation in the Eocene strata, Getic Basin.
The section consists of silty mudstone with interbeds of sandstone.
The deformation is in the form of a reverse fault.

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