Rockport Quarry Limestone

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]
Rockport Quarry Limestone
Stratigraphic range:
TypeGeological formation
Unit ofTraverse Group
UnderliesFerron Point Formation[1]
OverliesBell Shale[1][2]
ThicknessApproximately 14 meters[2]
Location
Region Michigan
Country United States

Fossil content
Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
 Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Vertebrates

The Devonian vertebrate fauna of the Rockport Quarry Limestone is the most diverse in Michigan.[1]

Acanthodians
Acanthodians reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
?Machaeracanthus ?M. sp. A single specimen (UMMP 13047).[1]

Cartilaginous fish
Cartilaginous fish reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Phoebodus P. cf. P. sophiae Alpena, Michigan.[3] A tooth.[3] An early elasmobranch.
?Tamiobatis ?T. sp. "At the abandoned Kelly Island Limestone Quarry at Rockport State Park, Alpena County".[1] A single small spine (UMMP 13147).[1] A ctenacanthoid.

Placoderms
Placoderms reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Dinomylostoma D. sp. [1] An arthrodire.
Dunkleosteus D. sp. Rockport Quarry, Alpena County.[1] A single incomplete right anterior ventrolateral (UMMP 16152).[1] An arthrodire.
Holonema ?H. rugosum A single specimen (UMMP 3898).[1] An arthrodire.
H. sp. 26 specimens.[1] An arthrodire.
Mylostoma M. sp. A single specimen (UMMP 13612).[1] An arthrodire.
Placodermi At the abandoned Kelly Island Limestone Quarry at Rockport State Park, Alpena County.[1] 2 specimens (7M, VP. 522.)[1] Placoderms of unknown affinity.
Protitanichthys P. rockportensis 59 specimens.[1] An arthrodire.
Ptyctodus P. sp. A single specimen (UMMP 13045).[1] A ptyctodontid.

Brachiopods
Brachiopods reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
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.

Bryozoans
Bryozoans reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Fenestellidae Species A [2]
Species B [2]
Species C [2]
Trepostomata Species A [2]
Species B [2]

Crustaceans
Crustaceans reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Ostracoda [2]
Phlyctiscapha P. rockportensis Basal part of the formation.[6] An ostracod.

Echinoderms
Echinoderms reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Crinoidea "Observed as disaggregated ossicles, ossicles stacked en echellon, and fragments of columnals".[2]

Molluscs
Molluscs reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Cephalopoda "All specimens collected as single-hand specimens".[2]
Gastropoda [2]

Sponges
Sponges reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Clathrodictyidae [2]
Idiostromatidae [2]
Stromatoporidae [2]

Trilobitomorphs
Trilobitomorphs reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Trilobitomorpha 200 m south of the large sinkhole on the west wall of Rockport Quarry.[2]

Plants and algae
Plants and algae reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
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
Cyanophytes reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
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
Foraminifera reported from the Rockport Quarry Limestone
GenusSpeciesPresence MaterialNotesImages
Family indet. "Found sparsely as solitary individuals in 6 specimens".[2]
Nodosinellidae [2]

See also

References
  1. 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.
  2. Cookman, C. W. (1976). "Petrology of the Rockport Quarry Limestone (Middle Devonian Traverse Group) Alpena, Presque Isle and Montmorency Counties, Michigan". S2CID 130419618. {{cite journal}}: Cite journal requires |journal= (help)
  3. 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 1 August 2023). ISSN 0003-0031.{{cite journal}}: CS1 maint: DOI inactive as of August 2023 (link)
  4. 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. {{cite journal}}: Cite journal requires |journal= (help)
  5. 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.
  6. Kesling, R. V. (1953). "A New Beyrichiid Ostracod from the Middle Devonian Rockport Quarry Limestone of Michigan". S2CID 127104889. {{cite journal}}: Cite journal requires |journal= (help)


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