Excerpt from Reports of Geological Explorations During 1871-72: With Maps and Sections
The next rocks in age, porphyry conglomerate, have also resisted very well the erosive action, but the brown coal beds lying upon them would have been greatly destroyed, had not in the first place a thick bed of Shell sandstone or limestone, often consisting almost entirely of shells, formed a protective cover over them. This limestone generally forms a ridge running in the direction of the strike of the beds.
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- PublisherForgotten Books
- Publication date2019
- ISBN 10 065605607X
- ISBN 13 9780656056071
- BindingHardcover
- Number of pages246