Walcott was the first geologist to identify pre-Cambrian fossil bacteria from microscopic examination of thin rock slices. 沃爾科特是第一個在岩石薄片鏡檢中鑒定出前寒武紀化石細菌的地質學家。
Geologists would also call it extrusive rock because it solidified on the Earth's surface. 因為它是噴出地球表面凝固而成，地質學家也稱它為噴出岩。
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