Its fine-grained, unstratified silt contains the remains of many terrestrial animals, including fifteen mammals. [Please select]
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They are rarely, if ever, seen in unstratified rocks; but many layers of stratified rocks abound in these remains. [Please select]
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A simpler term, however, quite as distinctive, and more descriptive of their structure, is that of the stratified and massive or unstratified rocks. [Please select]
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The first two great classes of rocks, the unstratified and stratified rocks, represent different epochs in the world's physical history: the former mark its revolutions, while the latter chronicle its periods of rest. [Please select]
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