Which Plateau is the index fossil found from the Devonian Period?Tug Hill PlateauAllegheny PlateauErie-Ontario Lowlands

The index fossil commonly associated with the Devonian Period is the Coral. During this time, various species of corals thrived in marine environments, making them important indicators for identifying Devonian rock layers.

Among the options provided:

1. Tug Hill Plateau - This plateau is primarily known for its glacial features and has Indiana limestone deposits but is not specifically known for Devonian index fossils.
2. Allegheny Plateau - This area is known for its coal deposits and also contains sedimentary rock layers that may include Devonian fossils but is not explicitly recognized for notable Devonian index fossils.
3. Erie-Ontario Lowlands - This region, particularly areas around Lake Erie, has a rich fossil record from the Devonian, making it significant for researchers studying this period.

In conclusion, while all regions might have Devonian fossils, the Erie-Ontario Lowlands is the most relevant region where significant index fossils from the Devonian Period can be found, particularly related to extensive marine life, including corals.