Helderberg Formation
The Helderberg Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
| 单词 | Helderberg Formation |
| 释义 |
Helderberg Formation
英语百科
Helderberg FormationThe Helderberg Formation is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period. |
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