The Student's Elements of Geology

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J. Murray, 1871 - 624 Seiten
 

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Seite 48 - The upper valve is almost invariably wanting, though occasionally found in a perfect state of preservation in the white chalk at some distance. In this case, we see clearly that the sea-urchin first lived from youth to age, then died and lost its spines, which were carried away. Then the young Crania adhered to the bared shell, grew and perished in its turn ; after which, the upper valve was separated from the lower, before the Echinus became enveloped in chalky mud.

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