The Rockport Quarry Limestone is a geologic formation in Michigan . It preserves fossils dating back to the middle Devonian period .
Stratigraphy of the Devonian deposits of the northern part of the Lower Peninsula of Michigan, showing the Rockport Quarry Limestone[ 1] Color key Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
The Devonian vertebrate fauna of the Rockport Quarry Limestone is the most diverse in Michigan .[ 1]
Acanthodians reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images ?Machaeracanthus ?M. sp. A single specimen (UMMP 13047).[ 1]
Brachiopods reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Chonetes C. mediolatus [ 4] Also found in the Bell Shale, Ferron Point Formation and St. Laurent Limestone . Pentamerella P. sp. B Basal 8 inches of the formation.[ 4] 2 specimens.[ 4] Pholidostrophia P. gracilis gracilis [ 4] Also found in the Bell , Ferron Point and Genshaw formations. Schizophoria S. ferronensis Basal 8 inches of the formation.[ 4] Also found in the Bell Shale, Ferron Point Formation and Silica Shale . Schuchertella S. crassa [ 4] Also found in the lower Bell Shale , Ferron Point Formation and Arkona Shale . Spinulicosta S. mutocosta [ 4] Also found in the Bell , Ferron Point , Four Mile Dam , Beebe School , Thunder Bay and Potter Farm formations. Strophodonta S. extenuata rockportensis Lower 8 inches of the formation.[ 4] Tylothyris T. rockportensis [ 5] Appears to be endemic to the Michigan Basin . T. subvaricosa [ 5] Also found in the Cedar Valley , Milwaukee , Mineola , Bell , Ferron Point , Genshaw , Alpena , Gravel Point , Norway Point and Potter Farm formations.
Echinoderms reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Crinoidea "Observed as disaggregated ossicles , ossicles stacked en echellon, and fragments of columnals".[ 2]
Molluscs reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Cephalopoda "All specimens collected as single-hand specimens".[ 2] Gastropoda [ 2]
Trilobitomorphs reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Trilobitomorpha 200 m south of the large sinkhole on the west wall of Rockport Quarry.[ 2]
Plants and algae reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Calcisphera C. sp. A "Abandoned quarry of the Onaway Limestone Company on the shore of Black Lake ".[ 2] C. sp. B "Abandoned quarry of the Onaway Limestone Company on the shore of Black Lake ".[ 2] Rhodophyta Indeterminate 200 m south of the large sinkhole on the west wall of Rockport Quarry.[ 2] Vermiporella "Observed as transverse sections, most specimens now irregular in shape due to crushing".[ 2]
Cyanophytes reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Genus and species indeterminate Indeterminate "Spherical bodies 3-5 microns in diameter".[ 2] Oncolite "Some post-depositional crushing of the sample has occurred".[ 2] Renalcis "Abandoned quarry of the Onaway Limestone Company on the shore of Black Lake ".[ 2]
Foraminifera reported from the Rockport Quarry Limestone Genus Species Presence Material Notes Images Family indet. "Found sparsely as solitary individuals in 6 specimens".[ 2] Nodosinellidae [ 2]
^ a b c d e f g h i j k l m n o p q r Stack, Jack; Sallan, Lauren (20 September 2018). "An examination of the Devonian fishes of Michigan" . PeerJ . 6 (2): e5636. doi :10.7717/peerj.5636 . PMC 6151260 . PMID 30258725 . ^ a b c d e f g h i j k l m n o p q r s t u v w x Cookman, C. W. (1976). "Petrology of the Rockport Quarry Limestone (Middle Devonian Traverse Group) Alpena, Presque Isle and Montmorency Counties, Michigan". S2CID 130419618 . ^ a b Swinehart, Anthony L.; Hoenig, Matthew M. J.; Ginter, Michal (July 2020). "A New Addition to the Devonian Elasmobranch Fauna of Michigan, U.S.A." The American Midland Naturalist . 184 (1): 109–115. doi :10.1637/0003-0031-184.1.109 (inactive 19 September 2024). ISSN 0003-0031 . {{cite journal }}
: CS1 maint: DOI inactive as of September 2024 (link ) ^ a b c d e f g h Imbrie, John (1959). "Brachiopods of the Traverse group (Devonian) of Michigan. Part 1, Dalmanellacea, Pentameracea, Strophomenacea, Orthotetacea, Chonetacea, and Productacea. Bulletin of the AMNH ; v. 116, article 4" . hdl :2246/1258 . ^ a b Rogers, Frederick S.; Pitrat, Charles W. (1987). "Distribution of Tylothyris (Brachiopoda) and Its Occurrence in the Traverse Group (Middle Devonian) of Michigan" . Journal of Paleontology . 61 (3): 494–507. Bibcode :1987JPal...61..494R . doi :10.1017/S0022336000028651 . ISSN 0022-3360 . JSTOR 1305304 . S2CID 130922140 . ^ Kesling, R. V. (1953). "A New Beyrichiid Ostracod from the Middle Devonian Rockport Quarry Limestone of Michigan". S2CID 127104889 .