... feet and the Rock River (Loc. 2) indicates a maximal thickness of 8,700 feet. Such differences in thickness are believed to be partly the result of faulting rather than to vagaries in deposition. However, the vertical distribution of graptolite zones ( Fig. 2 ) suggests that the formation thickens...

... be difficult, if not impossible, to differentiate. Rocks of the County Line olistolith ( Figs. 3 and 5 ) contain graptolites of the lower D. bifidus Zone and the Isograptus victoriae lunatus Zone. The exposure is poor and faulted and extends over a few tens of meters; it has a thickness of a few meters...

... of Geology 2003 Pseudoclimacograptus is a fairly distinctive genus of diplograptid. The type species, Climacograptus scharenbergi Lapworth, is well known from the description by Bulman (1947 , p. 65) of isolated specimens of Caradoc age from the Laggan Member of the Balclatchie Formation (Ingham...

...M. L. Larson; D. E. Jackson ABSTRACT The type section of the Glenogle Formation (Ordovician) is incomplete due to faulting and poor exposure, nevertheless, exposures in the Kicking Horse River Valley suggest that most of the zones recognized in unfaulted sections in the Stanford and Hughes Ranges...

...Harold Stowell; Carlos Zuluaga; Alan Boyle; Gerrit Bulman Abstract Metamorphic garnet with sector zoning in the cores and oscillatory zoning in the rims grew during rapid heating of pelitic rocks in the Chiwaukum Schist. These types of compositional zoning are exemplified by sharp, but low...

... limestones and mudstone interbeds; sampling of the lowest limestones for conodonts and the underlying mudstone for acritarchs proved fruitless. An estimated 94 m of steeply dipping, locally folded and faulted strata range from light-grey grainstone-packstone and coarse, thickly bedded calcarenite to thinly...

... contribution in this special issue focuses on metamorphic core complexes. Searle & Lamont discuss the evolution of the metamorphic core and how rocks that formed at lower crustal depths were uplifted to high structural levels. Also, low-angle ductile shear zones and normal faults that bound the upper...

...D.E. Jackson; B.S. Norford Abstract Graptolite zones of early and late Tremadoc ages are described from the Elmer Creek Formation in the Selwyn Basin and from the Duo Lake Formation in the Misty Creek Embayment. In ascending order, these are: Staurograptus dichotomus, Anisograptus matanensis...

... embracing Zones 16–19 at the base of the Silurian shale and the absence of the shale farther north may be the result of faulting but no discordance in attitude of beds was found across the Ordovician-Silurian contact. The graptolite succession throughout the world in its broad outline is everywhere...

..., 2001 ). In this setting, sediments of the Wheeler and Marjum formations were deposited within a 40 km long re-entrant on the passive Laurentian shelf margin known as the House Range Embayment ( Brady and Koepnick, 1979 ; Rees, 1986 ; Howley et al., 2006 ; Howley and Jiang, 2010 ). This fault-bounded...

... with graptolite zones marked X, a small fragment of Whitesburg faulted against it at 0, and Lenoir limestone at right, 1 2 mile east of Pratt’s Ferry Bridge over Cahaba River. Scale, 1 inch = 26.3 feet. It is thought that the basal part of the Athens shale was not deposited here, as the section...

..., and Steinmann & Hoek (1912) added further to the record of early and middle Ordovician graptolite faunas from southern Bolivia. Bulman (1931) gave the first more comprehensive description of the graptolite faunas of the whole of South America. Graptolite research in South America started to gain speed...

.... The Leinster terrane was dominated by Anglo-Welsh elements with varying proportions of the Scoto-Appalachian and Baltic faunas across the terrane. In the Iapetus suture zone in the east of Ireland the Grangegeeth terrane is characterized by a predominantly Scoto-Appalachian fauna. 21 11 1988 16 12...

... vertical circulation; (2) increased primary productivity, which caused an expansion of the oxygen minimum zone. This expansion, in ocean waters which were more prone to oxygen-starvation than those of today, resulted in prolonged accumulation of anoxic facies in the abyssal depths of the Iapetus Ocean...

... outside of north-central Nevada. Are they everywhere in faulted contact as in the Roberts Mountains? Are there areas of intermediate lithofacies? California. —Siliceous argillites, hornfels, and slates bearing Ordovician graptolites have been discovered in the Sierra Nevada near Convict Lake (1, Fig...

... a specimen figured· by Elles & Wood (1901-1918, plate 50, fig. 6b). This specimen, BU 1692, is from the S. turriculatus Zone of the Upper Birkhill Shales at Riskinhope Burn, Scotland, and is preserved flattened in dark grey, slightly silty shale. It has been generally interpreted that R. maximus...

... correlations indicate that the Assemblage 2 ‘Matane graptolites’ of southern Quebec (see Bulman, 1950 ) are all referable to the Rossodus manitouensis Zone in Laurentia ( Landing, Barnes & Stevens, 1986 ; Fig. 4 ). Consequently, the lower Río Salinas Member is also best correlated with the Rossodus...

... Kellaway G. A. Hancock P. L. Hancock P. L. Structure of the Bristol District, the Forest of Dean and the Malvern Fault Zone The Variscan Fold Belt in the British Isles 1983 Bristol Adam Hilger 88 107 Kennedy M. J. Harris A. L. Holland C. H. Leake B. E...

.... M. Cocks & P. Toghill B and ?Dimorphograptus sp.This graptolite fauna is of upper cyphus Zone age. The Woodland Formation has also yielded some fine dendroids (Bulman i928), particularly species of Dictyonema. At The Haven the lowest beds of the Woodland Formation are overlying the Craigskelly...

... 4 Zone are Pterograptus elegans Holm, Cryptograptus schaeferi Lapworth, Hustedograptus teretiusculus (Hisinger)?, Haddingograptus oliveri (Bouček), Glossograptus hincksii (Hopkinson), Pseudophyllograptus angustifolius s.l. (J. Hall), and Archiclimacograptus cf. riddellensis (Harris). Tetragraptus cf...