OTHER REMAINS FROM THE FALUNS OF TOURAINE

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Description	Collection	Origin
Septaria	B. Cossard	Channay-sur-Lathan

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This septaria was uncovered by Bruno Cossard near other specimens among which some had the size of a basketball. Partitions are composed by crystallized limestone (calcite or aragonite), less crystallized limestones rest against these partitions and the inside is filled with clay.
The formation of this rock started at the beginning of the tertiary era, a long time before the faluns' sea, from a ball of clay which was compacted under the effects of the accumulation of sediments. The clay cracked on this occasion and the groundwater charged in carbonates allowed the crystallization of limestone between cracks and around the ball of clay. Later, a phase of erosion released this rock which then knew phenomena of limestone's dissolving, producing its vacuolated aspect. Then it was reworked into the first sediments of the faluns' sea when this one invaded Touraine.
Thanks to Cyril Gagnaison for this determining.
See on this page another rock with a crystalline origin.