A MODE OF FOSSILIZATION IN TURONIAN AND SENONIAN STAGES
PRESERVATION OF THE SHELL : the calcareous shell (or the test for a sea urchin) has been preserved less change (or nearly).
Rhynchostreon suborbiculatum (Oyster)
A MODE OF FOSSILIZATION IN TURONIAN AND SENONIAN STAGES
INTERNAL MOULD : the shell has disappeared but its imprint remains with the sediment which filled it after the death of the animal.
Granocardium productum
A MODE OF FOSSILIZATION IN TURONIAN AND SENONIAN STAGES
EXTERNAL MOULD : the shell has disappeared but its imprint remains with the sediment which surrounded it.
Granocardium productum
A MODE OF FOSSILIZATION IN TURONIAN AND SENONIAN STAGES
NATURAL MOULDING : fossilization at two times. At first, formation of an external mould. In a second time, the hollow imprint was filled by a new sediment which, after hardening, reproduces exactly the shape of the living being.
imprint of fruit ?
A MODE OF FOSSILIZATION IN TURONIAN AND SENONIAN STAGES
SILICIFICATION : after burying of the living being, its molecules were replaced by molecules of silica.
silicified wood in partially silicified tuffeau