TRILOBITES, BIOSTRATIGRAPHY, AND LITHOSTRATIGRAPHY OF THECREPICEPHALUSANDAPHELASPISZONES, LOWER DEADWOOD FORMATION (MARJUMAN AND STEPTOEAN STAGES, UPPER CAMBRIAN), BLACK HILLS, SOUTH DAKOTA

Trilobites assigned to 29 genera and 39 species are reported from the Deadwood Formation in the Black Hills of South Dakota. Two new species, Prosaukia lochmani and Arcifimbria pahasapaensis, are described. Brachiopods are reported from the Taenicephalus Zone.A biostratigraphic zonation is established for the upper part of the Deadwood Formation. The Taenicephalus Zone in the lower part of the study interval is succeeded upsection by the Ellipsocephaloides Zone, both of which are assigned to the Franconian Stage. These two zones are overlain in turn by the Illaenurus and Saukia Zones of the Trempealeauan Stage. These zones are used to correlate this part of the Deadwood with coeval strata in Montana and Wyoming, central Texas, Oklahoma, and Alberta, Canada. The lowstand of sea level that occurred in the Great Basin at the time of the deposition of the Saukiella junia Subzone of the Saukia Zone probably extended eastward into the Black Hills, resulting in the absence of this fauna in the Black Hills.

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Borings in Quartzite Surf Boulders from the Upper Cambrian Basal Deadwood Formation, Black Hills of South Dakota

Ichnos ◽

10.1080/10420941003659618 ◽

2010 ◽

Vol 17 (1) ◽

pp. 48-55 ◽

Cited By ~ 11

Author(s):

Markes E. Johnson ◽

Mark A. Wilson ◽

Jack A. Redden

Keyword(s):

South Dakota ◽

Black Hills ◽

Upper Cambrian

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Ptychopleurites spinosa, a new trilobite species from the Upper Cambrian of Texas and South Dakota

Journal of Paleontology ◽

10.1017/s0022336000038178 ◽

1995 ◽

Vol 69 (6) ◽

pp. 1183-1185 ◽

Cited By ~ 1

Author(s):

James H. Stitt ◽

Wendy L. Metcalf

Keyword(s):

New Species ◽

South Dakota ◽

Black Hills ◽

Upper Cambrian ◽

Type Section ◽

Central Texas ◽

A New Species

During preparation of a manuscript on new collections of Upper Cambrian trilobites from the Threadgill Creek section in central Texas (Longacre, 1970, text-fig. 6), a new trilobite species Ptychopleurites spinosa was discovered that can be used to recognize a revised base to the Saukia Zone (Trempealeauan Stage) in central Texas. This species is represented in central Texas by numerous, well-preserved cranidia and librigenae, but no pygidia have been recovered. Recently Ptychopleurites spinosa was also identified in a collection of trilobites of the partly correlative Illaenurus Zone (= lower part of Saukia Zone) from the type section of the Deadwood Formation in the Black Hills of South Dakota. This work is part of a paper that will describe the latest Franconian and Trempealeauan trilobites from the Deadwood Formation, using collections made by Dr. Christina Lochman-Balk. Ptychopleurites spinosa is represented in the Black Hills by incompletely preserved cranidia and well-preserved librigenae. Because it is not known which of these two papers will be published first, it was decided to establish Ptychopleurites spinosa as a new species with one of the better Texas cranidia as the holotype and the Black Hills material as part of the suite of paratypes.

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Trilobites, biostratigraphy, and lithostratigraphy of the Crepicephalus and Aphelaspis zones, lower Deadwood Formation (Marjuman and Steptoean stages, Upper Cambrian), Black Hills, South Dakota

Journal of Paleontology ◽

10.1017/s0022336000031437 ◽

2000 ◽

Vol 74 (2) ◽

pp. 199-223 ◽

Cited By ~ 6

Author(s):

James H. Stitt ◽

Patrick J. Perfetta

Keyword(s):

New Species ◽

North America ◽

South Dakota ◽

Shallow Water ◽

Black Hills ◽

Strong Preference ◽

Upper Cambrian ◽

Shallow Subtidal ◽

Intrashelf Basin ◽

One New Species

Trilobites assigned to 25 genera and 39 species are reported from the Crepicephalus Zone (Marjuman Stage) and Aphelaspis Zone (Steptoean Stage) in the lower part of the Deadwood Formation in the Black Hills of South Dakota. Six taxa are left in open nomenclature, and one new species, Glaphyraspis newtoni, is described.Analysis of the lithologies for this interval from the best exposed measured sections on a southeast-northwest transect reveal a nearshore, shallow subtidal, siliciclastic dominated environment to the southeast, succeeded offshore by a shallow subtidal to lowest intertidal carbonate shoal environment, and then a transitional shaly limestone interval into a more shaly distal intrashelf basin to the northwest.Specimens of species of Coosia, Crepicephalus, Tricrepicephalus, Kingstonia, Pseudagnostina, and Coosina comprise more than 75 percent of the fauna of the Crepicephalus Zone. Coosina ariston, Crepicephalus snowyensis, Tricrepicephalus tripunctatus, Arcuolimbus convexus, and some species of Blountia had a strong preference for the shallow-water siliciclastic facies present in the southeastern sections closest to the paleoshoreline. Crepicephalus rectus, Tricrepicephalus coria, Agnostogonus, cf. A. incognitus and the genera Coosella and Uncaspis preferred the farther offshore, deeper-water, shaly intershelf basin located in the northern Black Hills. Trilobites from the Crepicephalus Zone are used to correlate the lower part of the Deadwood Formation with coeval strata elsewhere in North America.

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Additional information on lowest Ordovician trilobites from the uppermost Deadwood Formation, Black Hills and Bear Lodge Mountains, South Dakota and Wyoming

Journal of Paleontology ◽

10.1017/s0022336000031565 ◽

2000 ◽

Vol 74 (2) ◽

pp. 360-362 ◽

Cited By ~ 1

Author(s):

James H. Stitt

Keyword(s):

South Dakota ◽

North American ◽

Black Hills ◽

American Continent ◽

Upper Cambrian ◽

Additional Information ◽

North American Continent ◽

The North

Trilobites from the Missisquoia Zone and the Symphysurina brevispicata Subzone of the Symphysurina Zone (Ibexian Series, lowest Ordovician) were collected from measured sections in the uppermost Deadwood Formation in the Black Hills of South Dakota and Bear Lodge Mountains in northeasternmost Wyoming. These collections were made by Christina Lochman-Balk and her students, and turned over to the author to complete the project. They are compared with previous reported occurrences of this fauna from this area. No trilobites from the underlying Sunwaptan Stage (Upper Cambrian) occur with the lowest Ordovician trilobites, suggesting that the sharp faunal extinction at the base of the Ordovician (North American sense = Eurekia apopsis Zone, Ibexian Series) occurred in the Deadwood Formation as it did over all of the North American continent.

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Trilobites from the Cedarina dakotaensis Zone, lowermost part of the Deadwood Formation (Marjuman Stage, Upper Cambrian), Black Hills, South Dakota

Journal of Paleontology ◽

10.1017/s0022336000027384 ◽

1998 ◽

Vol 72 (6) ◽

pp. 1030-1046 ◽

Cited By ~ 10

Author(s):

James H. Stitt

Keyword(s):

New Species ◽

North America ◽

South Dakota ◽

Abundant Species ◽

Black Hills ◽

Basal Part ◽

Upper Cambrian ◽

Lowermost Part ◽

One New Species

Trilobites assigned to 14 genera and 14 species are reported from basal part of the Deadwood Formation in the Black Hills of South Dakota. Six additional taxa are left in open nomenclature. One new species, Cedarina dakotaensis, is described. These trilobites are assigned to a new zone, the Cedarina dakotaensis Zone, named after the most abundant trilobite species.Species of Cedarina and Modocia are the most abundant in the Cedarina dakotaensis Zone, accompanied by less common specimens of species of Arapahoia, Menomonia, Hardyoides, Welleraspis, Kormagnostus, and Kingstonia. Cedarina dakotaensis and Modocia centralis are the most abundant species in the nearshore sandstone lithofacies, whereas Arapahoia spatulata is the predominate taxon in the offshore limestone lithofacies.The fauna of the Cedarina dakotaensis Zone (which lacks species of Cedaria) occupies the biostratigraphic interval of the traditional Cedaria Zone of the Marjuman Stage. Trilobites from the Cedarina dakotaensis Zone can be used to correlate the basal part of the Deadwood with coeval strata elsewhere in North America.

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