Rockport Quarry Limestone

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

The Rockport Quarry Limestone is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.

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
Genus Species Presence Material Notes Images
?Machaeracanthus ?M. sp. A single specimen (UMMP 13047).[1]

Cartilaginous fish

Cartilaginous fish reported from the Rockport Quarry Limestone
Genus Species Presence Material Notes Images
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
Genus Species Presence Material Notes Images
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.

Invertebrates

Brachiopods

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.

Bryozoans

Bryozoans reported from the Rockport Quarry Limestone
Genus Species Presence Material Notes Images
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
Genus Species Presence Material Notes Images
Ostracoda [2]
Phlyctiscapha P. rockportensis Basal part of the formation.[6] An ostracod.

Echinoderms

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

Molluscs reported from the Rockport Quarry Limestone
Genus Species Presence Material Notes Images
Cephalopoda "All specimens collected as single-hand specimens".[2]
Gastropoda [2]

Sponges

Sponges reported from the Rockport Quarry Limestone
Genus Species Presence Material Notes Images
Clathrodictyidae [2]
Idiostromatidae [2]
Stromatoporidae [2]

Trilobitomorphs

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

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

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

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]

See also

References

  1. ^ 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.
  2. ^ 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. {{cite journal}}: Cite journal requires |journal= (help)
  3. ^ 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 12 July 2025). ISSN 0003-0031.{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link)
  4. ^ 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. {{cite journal}}: Cite journal requires |journal= (help)
  5. ^ 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.
  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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