Gravel Point Formation

The Michigan Basin was a shallow marine shelf during the middle Devonian, located between 30º South and 20º North latitude in central Laurasia. According to stratigraphic and paleontological examination, the sediments of the Gravel Point Formation were deposited in a shallow lagoonal reef environment. ==Fossil content==

Vertebrates Acanthodians Bony fish Placoderms Invertebrates Several species of ostracods, an unidentified arthropod 'hook', crinoid columnals and several species of polychaetes and scolecodonts are known from the formation. Brachiopods Bryozoans Cnidarians Sponges Tentaculitans Trilobites Flora Algal colonies are known from the formation. Acritarchs Plants ==See also==