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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 31 January 2024). ISSN 0003-0031 . {{cite journal }}
: CS1 maint: DOI inactive as of January 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. 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 .