Rockport Quarry Limestone
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Geologic formation in Michigan, United States
| Rockport Quarry Limestone | |
|---|---|
| Stratigraphic range: Middle Devonian (Givetian)[1] | |
| Type | Geological formation |
| Unit of | Traverse Group |
| Underlies | Ferron Point Formation[1] |
| Overlies | Bell Shale[1][2] |
| Thickness | Approximately 14 meters[2] |
| Location | |
| Region | Michigan |
| Country | United States |
The Rockport Quarry Limestone is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
Vertebrates
Color key
|
Notes Uncertain or tentative taxa are in small text; |
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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 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.
- 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 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) - 1 2 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) - 1 2 3 4 5 6 7 8 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) - 1 2 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.
{{cite journal}}: Cite journal requires|journal=(help)
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