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VII.—On the Occurrence of a Freshwater Sponge in the Purbeck Limestone

Published online by Cambridge University Press:  01 May 2009

John T. Young
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Extract

In the course of a re-investigation into the vexed question of the origin and nature of Chalk flints, the very natural suggestion occurred to me that the remains of a fresh water sponge might probably be found in the “flints” of the Purbeck limestones, and a recent visit to Lulworth afforded the opportunity of verifying the conjecture. Patches of spicules with valves of Cypris, etc., etc., occur in most of the specimens then obtained.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 5 , May 1878 , pp. 220 - 221
Copyright
Copyright © Cambridge University Press 1878

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References

1 Or more properly “chert.”