Zobrazeno 1 - 10
of 27
pro vyhledávání: '"S. Henry Williams"'
Publikováno v:
American Journal of Science. 320:450-477
The thrust front of the Northern Appalachians involves Ediacaran rift-related structures of the Laurentian margin that were re-worked in Taconic (Ordovician), Salinic (mainly Silurian) and Acadian (mainly Devonian) deformation events. Much of the thr
Publikováno v:
Gondwana Research. 74:216-236
The Humber Arm Allochthon was structurally emplaced onto the Laurentian margin in western Newfoundland during Taconian (Ordovician) and Acadian (Devonian) deformation. On Port au Port Peninsula, disrupted allochthonous rocks previously mapped as mela
Publikováno v:
Episodes. 31:315-318
The Global Stratotype Section and Point (GSSP) for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Su
Autor:
S. Henry Williams, David A. T. Harper
Publikováno v:
Lethaia. 35:71-78
At Yewdale Beck in northern England, a brachiopod fauna dominated by species of Hindella, Kinnella, Mirorthis, Paromalomena and Plectothyrella, occurs interbedded with a graptolite fauna which includes Akidograptus ascensus, Atavograptus ceryx, Persc
Publikováno v:
Geological Society of America Bulletin. 113:109-128
Biostratigraphic investigation of the graptolite and conodont faunas of the western part of the Hamburg klippe of eastern Pennsylvania permits a revised stratigraphic framework and new conclusions regarding its likely tectonic setting. Graptolite and
Autor:
Lorna C. Clarke, S. Henry Williams
Publikováno v:
Palaeontology. 42:1003-1015
Studies on graptolite taxonomy and phylogeny in recent years have placed great emphasis on the proximal development of the rhabdosome, particularly the presence or absence of a virgella and early thecal growth patterns. As the prosicula was the earli
Autor:
Nicole K. Underhay, S. Henry Williams
Publikováno v:
Canadian Journal of Earth Sciences. 32:895-901
A scolecodont (polychaete jaw) fauna from the latest Tremadoc and Arenig strata of the Cow Head Group includes some of the earliest representatives of these fossils in the world. No biostratigraphically useful changes seem to occur within the interva
Autor:
S. Henry Williams
Publikováno v:
Palaeontographica Abteilung A. 235:21-77
Autor:
S. Henry Williams
Publikováno v:
Transactions of the Royal Society of Edinburgh: Earth Sciences. 85:143-155
Critical collecting, measurement of sections and taxonomic reassessment through the Climacograptus wilsoni Zone (basal Lower Hartfell Formation) of the southern Scottish graptolite zonal sequence suggests that, although only locally developed, it is
Publikováno v:
Canadian Journal of Earth Sciences. 29:2046-2057
A newly discovered fossiliferous horizon within sediments belonging to the Coy Pond Complex of the Exploits Subzone in central Newfoundland yields the graptolite Undulograptus austrodentatus s.l. and cyclopygid trilobite Cyclopyge grandis brevirhachi