Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Michigan breccia flow of Gratau.
Lots north of St. Ignace, Michigan
tr ue breccia flows of Lower Monroan
(Lilnic). Breccia in Upper Monroan of
Lower Devonian age. Can be followed
across Chaelinae straits to the Chaelinac
shore - ten miles across. Best developed on
Island of Chaelinae; here the blocks are
of its tent feet across.