Stone in Archaeology Database


Purbeck Stone - Thornback

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Local Name(s): Purbeck Stone - Thornback. Example of Purbeck Stone - Thornback
Stone Group: Sedimentary
Stone Type: Limestone
Geology:
Era:   Mesozoic
Period:   Jurassic
Epoch:   Upper
Geological Sub-Divisons:

Middle Purbeck Division of the Upper Jurassic.

General Colour Description:

A cream to grey/buff colour with large fragments of darker grey shell.

Hand Specimen Description:

A hard, poorly sorted, coarse textured, bioclastic limestone. There are several types of Purbeck Thornback, which differ slightly in colour and number of shells.

Stone Identifiers: Calcareous,  Fossiliferous.
Reacts dilute to HCl? Yes