1-20 OF 83 RESULTS FOR

Aphelaspis

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 March 2000
Journal of Paleontology (2000) 74 (2): 199–223.
...JAMES H. STITT; PATRICK J. PERFETTA Abstract 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...
FIGURES | View All (14)
Journal Article
Published: 01 May 1962
Journal of Paleontology (1962) 36 (3): 431–441.
Image
Correlation of the  <b>Aphelaspis</b>  fauna in the Conasauga Formation at the TBR...
in > PALAIOS
Published: 22 May 2019
Fig. 3.— Correlation of the Aphelaspis fauna in the Conasauga Formation at the TBR site (asterisk). Global stratigraphy based largely on Peng et al. (2009) .
Image
A )  <b>Aphelaspis</b> brachyphasis  holaspids from TBR site. The intact sclerites...
in > PALAIOS
Published: 22 May 2019
Fig. 4.— A ) Aphelaspis brachyphasis holaspids from TBR site. The intact sclerites and iron oxide rings around individuals suggests that these were whole-body specimens at the time of burial ( fide Schwimmer and Montante 2007 ). B ) Representative individuals in the meraspid cluster, showing
Image
F igure  12 —Trilobites from the  <b>Aphelaspis</b>  Zone. All specimens exfoliate...
Published: 01 March 2000
F igure 12 —Trilobites from the Aphelaspis Zone. All specimens exfoliated unless otherwise noted. 1, 2, Homagnostus obesus (Belt); 1, cephalon, ×8, M 73, UMC 17453; 2, pygidium, ×9, M 73, UMC 17454. 3, 4, Blountia bristolensis Resser; 3, cranidium, ×3.5, LEC 91–93, UMC 17455; 4
Image
F aunal  R ange  C hart ,  <b>Aphelaspis</b>  Z one ,  and  Z ones  B, G, S hell  ...
Published: 01 June 1967
Table IV. F aunal R ange C hart , Aphelaspis Z one , and Z ones B, G, S hell O il C o . 43-22A U nit , P ine F ield , W ibaux C ounty , M ontana (C., NE. 1 4 , SE. 1 4 , SEC. 22, T. 11 N., R. 57 E.)
Journal Article
Published: 01 November 1998
Journal of Sedimentary Research (1998) 68 (6): 1212–1222.
... of the succession contains Aphelaspis zone fauna (Early Steptoean). The extensively dolomitized and poorly fossiliferous nature of the upper part of the succession precludes any detailed biostratigraphic determinations. Correlation with similar positive carbon-isotope excursions in coeval successions elsewhere...
Journal Article
Journal: GSA Bulletin
Published: 01 February 1998
GSA Bulletin (1998) 110 (2): 188–210.
... belt around the Wisconsin arch. At the same time, finer grained, feldspathic sandstone, siltstone, and shale aggraded in deeper water immediately seaward of the quartzose sand, and shale and carbonate sediment accumulated in the most distal areas. During Aphelaspis and Dunderbergia Zones time...
Journal Article
Journal: AAPG Bulletin
Published: 01 May 1974
AAPG Bulletin (1974) 58 (5): 914.
... lithotopes (3) through (5) are present. The Cedaria Zone is largely (4) and the Crepicephalus and Aphelaspis Zones are (5b). Seas withdrew after initial Aphelaspis Zone deposition and returned at about the beginning of the Elvinia Zone. Elvinia, Taenicephalus, Idahoia , and early Saukiella Zones are (5b...
Journal Article
Published: 01 January 1962
Journal of Paleontology (1962) 36 (1): 87–96.
...Allison R. Palmer Abstract Study of silicified ontogenetic series of opisthoparian (Aphelaspis), gonatoparian (Glaphyraspis), and proparian (Hardyoides) trilobites indicates the probable homology of cephalic spines in ptychopariid trilobites. Opisthoparia, gonatoparia, and proparia are redefined...
Series: GSA Special Papers
Published: 01 January 1944
DOI: 10.1130/SPE54-p1
... sections of central Montana to those of southern and southwestern Montana is clarified. A paleogeographic map showing the changing positions of land and sea areas during the Upper Cambrian is presented. The early Upper Cambrian faunal zones ( Cedaria , Crepicephalus , and Aphelaspis ) have all been...
Journal Article
Journal: PALAIOS
Published: 22 May 2019
PALAIOS (2019) 34 (5): 254–260.
...Fig. 3.— Correlation of the Aphelaspis fauna in the Conasauga Formation at the TBR site (asterisk). Global stratigraphy based largely on Peng et al. (2009) . ...
FIGURES | View All (4)
Journal Article
Published: 01 January 2016
Journal of Sedimentary Research (2016) 86 (1): 11–37.
... deposited in six temporally distinct phases involving two transgressive–highstand systems tract couplets during the Bolaspidela through Crepicephalus biozones, a falling-stage systems tract in the Aphelaspis Biozone, and a lowstand systems tract in the Elvinia Biozone following the Sauk II–Sauk III hiatus...
FIGURES | View All (20)
Journal Article
Published: 01 March 2012
Journal of Paleontology (2012) 86 (2): 201–237.
... and correlates with the lower part of the Paibian and the basal Steptoean of North America. The “Innitagnostus” inexpectans Fauna is more diverse and likely correlates into part of the lower Steptoean Aphelaspis Zone of western North America. The youngest fauna, the Acmarhachis kindlei n. sp. Fauna, also...
FIGURES | View All (22)
Journal Article
Journal: Palynology
Published: 01 January 2008
Palynology (2008) 32 (1): 205–212.
... in eastern Tennessee, U.S.A., where it is found in two cores drilled in the grounds of the Oak Ridge National Laboratory. The Upper Shale Member corresponds to the upper part of the Cedaria–Crepicephalus biozone and the lower part of the Aphelaspis biozone, and is Late Cambrian in age. The distinctive...
FIGURES | View All (4)
Journal Article
Journal: GSA Bulletin
Published: 01 March 1998
GSA Bulletin (1998) 110 (3): 285–297.
...Matthew R. Saltzman; Bruce Runnegar; Kyger C. Lohmann Abstract A large, global positive excursion in δ 13 C (from ∼0.5 to 4.5‰) during the Late Cambrian Pterocephaliid biomere/Steptoean Stage (Aphelaspis-Elvinia zones) is documented at high stratigraphic resolution in three sections in the eastern...
Series: GSA Memoirs
Published: 01 January 1992
DOI: 10.1130/MEM170-p125
..., Chinese, and southern Russian affinities and represents three distinct faunal assemblages. Trilobites from the base of the Minaret Formation at Yochelson Ridge represent the Aphelaspis Zone, and trilobites from the Minaret Formation at Springer Peak represent the Dunderbergia Zone. A single...
Journal Article
Journal: Geology
Published: 01 February 1985
Geology (1985) 13 (2): 139–143.
...), Steptoean Stage (replaces Pterocephaliid Biomere, lower boundary at base Aphelaspis Zone), Sunwaptan Stage (replaces Ptychaspid Biomere, lower boundary at base Irvingella major Subzone). The base of the overlying Ibexian Series is placed at the base of the Eurekia apopsis Subzone. Geological Society...
Series: GSA Special Papers
Published: 01 January 1982
DOI: 10.1130/SPE190-p469
... dominances to a low diversity fauna dominated by only one or two species takes place within a few centimeters of section. There is no evidence in the beds below the extinction event of any signs of community deterioration. The best documented change, between the Late Cambrian Crepicephalus and Aphelaspis...
Journal Article
Journal: GSA Bulletin
Published: 01 January 1974
GSA Bulletin (1974) 85 (1): 135–140.
...CHRISTINA LOCHMAN-BALK Abstract An examination of the taxonomic composition of the North American late Dresbachian faunules described to date indicates that there is an Aphelaspis Zone faunal assemblage characteristic of the early half of the late Dresbachian Stage and a Dunderbergia Zone faunal...