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Gryphaea arcuata
Upper surface of Gryphaea -rich argillaceous limestone bed within upper Sc...
Figure 3. Molluscs from silicified fauna, showing fine preservation of shel...
Regular echinoid grazing traces (Gnathichnus pentax Bromley) on left valv...
Gryphaea beds (upper Scunthorpe Mudstone Formation; Lower Jurassic) at Scunthorpe, North Lincolnshire, north-east England
The Paleontological Society
The Hettangian–Sinemurian (Lower Jurassic) strata of Redcar, Cleveland Basin, NE England: facies and palaeoecology
Missing molluscs: Field testing taphonomic loss in the Mesozoic through early large-scale aragonite dissolution
Escalation in Late Cretaceous–early Paleocene oysters (Gryphaeidae) from the Atlantic Coastal Plain
Sequence architecture of ancient rocky shorelines and their response to sea-level change: an Early Jurassic example from South Wales, UK
JURASSIC OSTREOIDA (BIVALVIA) FROM CHINA (TANGGULA MOUNTAINS, QINGHAI-XIZANG PLATEAU) AND THEIR PALEOBIOGEOGRAPHIC CONTEXT
Observations on Marine Lower Jurassic Stratigraphy of North America, with Special Reference to United States
The Market Weighton High in the 21st century – new understanding of a long-standing problem
Marine Jurassic of Black Hills Area, South Dakota and Wyoming
A Middle Pleistocene palaeovalley-fill west of the Malvern Hills
Systematics in palaeontology: President’s anniversary address 1969
ISOTOPE SCLEROCHRONOLOGY AND SEASON OF ANNUAL GROWTH LINE FORMATION IN LIMPET SHELLS ( PATELLA VULGATA) FROM WARM- AND COLD-TEMPERATE ZONES IN THE EASTERN NORTH ATLANTIC
Opening of the Hispanic Corridor and Early Jurassic bivalve biodiversity
Abstract The Hispanic Corridor is a postulated marine seaway linking the eastern Pacific and western Tethyan oceans as early as Early Jurassic times. Two existing hypotheses relate the Pliensbachian-Toarcian bivalve extinction and recovery to immigration of bivalve species through the Hispanic Corridor. The extinction hypothesis implies that, in South America, the Pliensbachian-Toarcian extinction can be partly explained by the immigration of bivalves through the Hispanic Corridor and subsequent competitive replacement. The recovery hypothesis states that, in NW Europe, the renewed rise in diversity in the late Toarcian/Aalenian was largely a consequence of immigration of taxa from Andean South America via the Hispanic Corridor. To test these hypotheses, I calculated immigration and origination rates of bivalves per million years. In both regions, early Pliensbachian to Aalenian immigration rates remained at low levels, thus disproving both hypotheses. By comparison, the origination of new species generally played a much more important role than immigration in controlling overall diversity of both regions. Future research should investigate if this is a more general pattern in the recovery of post-extinction biotas. The apparently global Pliensbachian-Toarcian diversity crisis may be best explained by a combination of physicochemical factors, invoking intense volcanism, sea-level highstand and widespread anoxia, as well as biological factors. Recovery from this mass extinction commenced when origination rates increased again, which, in the Andean basins, was in the Aalenian and in NW Europe, the late Toarcian.
Late Triassic Bivalvia (Chiefly Halobiidae and Monotidae) from the Pardonet Formation, Williston Lake Area, Northeastern British Columbia, Canada
Abstract Until the late 20th century, accounts of the Jurassic rocks of Scotland mainly comprised descriptions of the fine coastal outcrops of the Inner Hebrides region, with emphasis also on the east Sutherland coast with its spectacular boulder beds of Kimmeridgian age. That changed with the discovery and development of the North Sea oilfields, where much of Britain’s oil is found in Jurassic sandstone reservoirs and has its source in Kimmeridge shale. Thus for many geologists the Jurassic is known principally from seismic reflection lines and downhole geophysical logs. Hydrocarbon exploration also revealed a major episode of Jurassic volcanism in the Central North Sea. Nevertheless, the onshore outcrops retain their relevance. Those along the Moray Firth are directly marginal to the Inner Moray Firth Basin and provide many analogies to the other North Sea Basins. The western outcrops, with a much more complete section exposed, were important in the history of geology and continue to stimulate research in biostratigraphy, sedimentology and palaeoecology. They also serve as onshore guides to the stratigraphy of the recently explored basins to the west of Scotland.
Abstract >The Jurassic Period in NW Europe began with an interval of pulsed subsidence that may be linked to local extensional fault movements. This parallels movements farther south where the western end of the Tethys opened in the Early Jurassic with a period of discontinuous rifting that lasted some 40 Ma and that is referred to as the Ligurian cycle; this phase of extensional tectonism resulted in block-faulting and tilting and was followed by rapid subsidence and the development of regional erosional surfaces (De Graciansky et al. 1998). The Tethys Ocean had long been established as a large oceanic area contiguous with the great Panthalassa Ocean to the east, but in the Early Jurassic it was bounded by continental areas on all other sides, with little marine connection across these areas. Britain was situated in a seaway between the Laurentian margin and Scandinavia that allowed limited interchange of water northwards from the Tethys into the Arctic Sea; the latter extended from about 60°N to the pole. This seaway was interrupted by a series of islands of different sizes, including in the western European area the Spanish Meseta, the French Massif Central and Brittany, the Anglo-Brabant Massif, Cornubia, much of Ireland, the Scottish Highlands and Rockall. Interchange of waters between the Tethys and the Arctic sea was of fundamental importance in governing the faunas of the area; this movement was forced by differences in water-densities across the area, water flowing towards the areas of greater density. The Arctic sea received a considerable input of freshwater from high precipitation and continental run-off.