caa a22 4500 388017600 CHVBK 20180307124915.0 cr unu---uuuuu 161130e199811 xx s 000 0 eng 10.1017/S0022336000027384 doi S0022336000027384 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000027384 Stitt James H. Department of Geological Sciences, University of Missouri-Columbia, Columbia 65211 Trilobites from the Cedarina dakotaensis Zone, lowermost part of the Deadwood Formation (Marjuman Stage, Upper Cambrian), Black Hills, South Dakota [Elektronische Daten] [James H. Stitt] 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. Copyright © The Paleontological Society Journal of Paleontology Cambridge University Press 72/6(1998-11), 1030-1046 0022-3360 72:6<1030 1998 72 JPA https://doi.org/10.1017/S0022336000027384 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000027384 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Stitt James H. Department of Geological Sciences, University of Missouri-Columbia, Columbia 65211 NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/6(1998-11), 1030-1046 0022-3360 72:6<1030 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge