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Astraspis

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Journal Article
Published: 01 September 1982
Journal of Paleontology (1982) 56 (5): 1187–1196.
Journal Article
Published: 01 March 1960
Journal of Paleontology (1960) 34 (2): 372–373.
...Ted Harry Foss Abstract Standard X-ray diffraction studies of Neurodontiformes and associated Astraspis scales from the Harding formation [Ordovician] show they are both closer in composition to carbonate-fluorapatite than to pure fluorapatite as previously thought. GeoRef, Copyright 2004...
Journal Article
Published: 01 June 1973
Canadian Journal of Earth Sciences (1973) 10 (6): 954–960.
...Leslie S. Eliuk Abstract Ostracoderm tubercles were recovered from the lower portion of two Black River Group sections between Montreal and Quebec City. Some of these fish remains seem identical to tubercles of Astraspis desiderata from the Harding Sandstone of Colorado. The age of the Quebec...
Journal Article
Journal: PALAIOS
Published: 01 December 2005
PALAIOS (2005) 20 (6): 518–533.
...-marine habitat for these primitive vertebrates. Society for Sedimentary Geology 2005 09 02 2005 The Late Ordovician Harding Sandstone of central Colorado is well known for its occurrences of pteraspidomorph agnathans, particularly the abundant dermal plates of Astraspis desiderata...
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Journal Article
Journal: Geology
Published: 01 November 2006
Geology (2006) 34 (11): 969–972.
... (SUI 102854). D: Upper: paired conodont elements associated with impressions of soft-bodied material. Lower: close-up images; photo 1 is taken from the counterpart of the same sample (SUI 102855). E: Partial head shield of Astraspis sp. (SUI 102856). F: A complete eurypterid leg (SUI 102857). G...
FIGURES
Journal Article
Published: 01 April 1983
Earth Sciences History (1983) 2 (1): 66–75.
... National Museum, labelled as the oldest vertebrate remains in the world. A footnote added in March 1892 to Walcott’s paper commented on a partially complete skull fragment of Astraspis desiderata ; this important specimen was collected by Loper. In spite of its significance 25 years elapsed before...
FIGURES
Image
Figure 2. Selected fossils from the Middle Ordovician Winneshiek Lagerstät...
Published: 01 November 2006
denticles (SUI 102854). D: Upper: paired conodont elements associated with impressions of soft-bodied material. Lower: close-up images; photo 1 is taken from the counterpart of the same sample (SUI 102855). E: Partial head shield of Astraspis sp. (SUI 102856). F: A complete eurypterid leg (SUI 102857). G
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1954
AAPG Bulletin (1954) 38 (2): 284–305.
... plates of the primitive vertebrates, Astraspis and Eriptychius , are the only ubiquitous fossils noted, although it is probable that the conodonts are equally as widespread, and could be collected from the quartzitic sections of west-central Colorado if a satisfactory method could be devised...
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Series: Geological Society, London, Special Publications
Published: 01 January 2002
DOI: 10.1144/GSL.SP.2002.194.01.06
EISBN: 9781862394421
... was thought to be that from the Harding Sandstone (Caradoc) of Colorado, USA, which had been the first locality to yield pre-Silurian vertebrates. Walcott (1892) described three species of fishes from the Harding Sandstone: Astraspis desiderata , Eriptychius americanus and Dictyorhabdus priscus . The last...
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Series: Geological Society, London, Memoirs
Published: 01 January 2013
DOI: 10.1144/M38.28
EISBN: 9781862396425
... exoskeleton. They are represented, amongst others, by (1) jawless taxa such as Pteraspidomorphi – arandaspids ( Arandaspis and Sacabambaspis ), which occur in Bolivia, Argentina, Oman and Australia, astraspids ( Astraspis) and Eriptychius , which occur in North America ( Turner et al. 2004 ; Sansom et...
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Series: GSA Field Guide
Published: 01 January 2013
DOI: 10.1130/2013.0033(02)
EISBN: 9780813756332
.... U.S. Geological Survey Logo (1909). Figure 12. Original Harding quarry, type locality still an active quarry today, Walcott, U.S. Geological Survey (1890). Figure 13. Astraspis desiderata. Figure 14. (A) Eriptychius (x10). (B) Astraspis (x10). (C) Astraspis (x20...
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