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Hawthorn Group : ウィキペディア英語版 | Hawthorn Group
The Hawthorn Group is a Late Oligocene to Pliocene grouping of several geologic formations and members in North Florida, United States. The Hawthorn Group was originally called the Waldo Formation in 1887 by L. C. Johnson of the USGS and became Hawthorne beds for sediments being quarried and ground up as fertilizer near Hawthorne, Florida.〔(Geology of Florida: Miocene to Holocene. University of Florida Geology )〕 ==Age== Period: Neogene Epoch: Miocene Faunal stage: Chattian through early Blancan ~28.4 to ~2.588 mya, calculates to a period of
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