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Iterative evolution of Middle Jurassic ammonite faunas
Lethaia, 1984The phenomenon of iterative evolution of homeomorphs in identical temporal sequences is exhibited by Aalenian and Bajocian ammonite faunas in the south German depositional basin. Within each evolutionary cycle, inflated, evolute, and ornamented shells with complex suture lines are successively replaced with discoidal, involute, smooth shells with ...
Ulf Bayer, George R. McGhee
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Middle Jurassic Porifera from Kachchh, western India
Paläontologische Zeitschrift, 1997From the Late Bathonian sponge biofacies at Jumara Dome, Kachchh (western India) 11 species of ‘lithistid’, hexactinellinid and calcarean sponges are described. New taxa are the order Sigmatospirida, the genusJumarella, and the speciesJumarella astrorhiza, Mastosia rhytidodes, Radicispongia kraspedophora, andHexactinella prisca.
Dorte Mehl, Franz Theodor Fürsich
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The Middle Jurassic succession at Ketton, Rutland
Proceedings of the Geologists' Association, 2007The cement quarry at Ketton is the most important Middle Jurassic locality in inland England. For many years it has exposed the Lincolnshire Limestone, Rutland and Blisworth Limestone Formations. Excavations in the lower quarry have allowed access to the Northampton Sand and Grantham Formations, and temporarily to the Whitby Mudstone Formation, while ...
J.D. Hudson, R.G. Clements
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Jurassic faunas of the Canadian Arctic, Lower Jurassic and lowermost Middle Jurassic ammonites
1960Lower Jurassic and lower Bajocian faunas are widely distributed in the Canadian Arctic, particularly in the Arctic Archipelago, where marine lower Sinemurian, Toarcian, and Bajocian are represented. In the Aklavik Range (northeastern Richardson Mountains, Arctic Coast region) lower and upper Sinemurian rocks are present; farther to the west lower ...
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Middle Jurassic Ostracoda from South Yorkshire
1963(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Discovery of Middle Jurassic mammals from Siberia
2005Averianov, Alexander O., Lopatin, Alexey V., Skutschas, Pavel P., Martynovich, Nikolai V., Leshchinskiy, Sergei V., Rezvyi, Anton S., Krasnolutskii, Sergei A., Fayngertz, Alexey V. (2005): Discovery of Middle Jurassic mammals from Siberia.
Averianov, Alexander O. +7 more
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Middle Jurassic with Selliporella donzellii
2007Algal remnants, that occur only rarely in the lower part of the Biokovo road, become more frequent and abundant as we go higher through the succession. The maximum concentration of the algal skeletons or skeletal fragments, mostly of Selliporella donzellii SARTONI & CRESCENTI, occur within individual beds or thinner intervals of successive layers in ...
Sokač, Branko, Velić, Ivo
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Middle Jurassic Ostracoda from north Lincolnshire
1963(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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The Zuni Sequence: Middle Jurassic—Upper Cretaceous
1987Craton. The Zuni cratonic sequence contains strata ranging in age from Early Jurassic (Sinemurian) through latest Cretaceous (Maestrichtian). The principal areas of Zuni sedimentation were: in the western craton and Cordillera, reaching from Alaska to Mexico; on the eastern continental margin, where the Atlantic Coastal Plain first developed during ...
William J. Frazier, David R. Schwimmer
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Middle Jurassic at Praia da Mareta, Algarve
2023Portugal is known for its extraordinary beaches and inviting climate. But on our beaches there is much more to discover than just sun and sea. There is a country rich in geological data that allows us to reconstruct our history.By observing geological occurrences in a given location, it is possible to understand what kind of environments existed and ...
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