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On the Occurrence of Ankerite in a Band of Non-marine Lamellibranchs from the Lancashire Coal Measures

Published online by Cambridge University Press:  01 May 2009

F. M. Broadhurst  and
R. A. Howie
F. M. Broadhurst
Affiliation:
Geology Department, The University, Manchester, 13.
R. A. Howie
Affiliation:
Geology Department, The University, Manchester, 13.
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Abstract

The shell-substance of the non-marine lamellibranchs from a band in the Lower similis-pulchra Zone of Lancashire is shown to be ankerite. The same mineral also forms pockets inside certain of the shells, the pockets being developed most frequently in the stratigraphically uppermost part of the spaces between the valves. It is considered that the ankerite in the pockets has occupied spaces left by shrinkage of the original mud-filling of the shells. Chemical analyses, specific gravity, and optical properties of the ankerite are given; its composition closely approximates to (Mg2Fe)Ca3(CO3)6.

Type
Articles
Information
Geological Magazine , Volume 95 , Issue 5 , October 1958 , pp. 397 - 402
Copyright
Copyright © Cambridge University Press 1958

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References

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