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Such an overwhelming majority of the floral and faunal remains of the earth's crust have been yielded by rocks of sedimentary origin that generalized statements concerning the occurrence of fossils often neglect their more rare appearance in metamorphic and igneous rocks. In fact there is the temptation, after volcanic tuffs have been excluded as more or less sedimentary, to venture the positive assertion that by their very character igneous rocks are incapable of recording the presence of the life which may have existed at the time of their extrusion. As a result, most that has been written concerning fossil floras and faunas refers to their occurrence in sediments and only occasionally and incidentally, as it were, does the literature take up the matter of fossil remains in igneous rocks.
Beck, G. F. (1935). Fossil Bearing Basalts (More particularly the Yakima Basalt of Central Washington). Northwest Science, 9(4), 4-7.
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This article was originally published in Northwest Science.