A fossil record full of holes: the Phanerozoic history of drilling predation: comment

Article Abstract:

The history of drilling predation is discussed wit the contentipn that, although the predation has been a threat continuously in the Phanerozoic and activities of two major clades of drilling gastropods are very important in Cenozoic fauna, the model for variation and importance of drilling predation through time should be somewhat refined. Four-holed Jurassic fossils were seen by other authors as representative of victims of drilling predators. Using the literature, an effort was made to show that the history of drilling predation is continuous since the Late Precambrian, in three waves.

United Kingdom, Standards, Statistical Data Included, Environmental aspects, Predation (Biology), Mesozoic Era, Biological models, Statistical sampling, Sampling (Statistics), Marine ecology, Cretaceous period, Gastropoda, Gastropods, Precambrian Era, Brachiopoda, Brachiopods, Geological modeling, Geological models

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Magmatic crystallization, isobaric cooling, and decompression of the garnet-bearing assemblages of the Jijal sequence (Kohistan terrane, western Himalayas)

Article Abstract:

The Jijal ultramafic-mafic sequence, being the lowermost exposed part of the Kohistan terrane, exhibits garnet-bearing assemblages consisting of a mosaic of magmatic and metamorphic equilibria in its petrography and geothermobarometry. Garnet minerals began to develop and crystallize on these magmatic assemblages at a depth of 50 square kilometers. These developments paved the way for quasi-isobaric cooling of these assemblages, thereby, achieving partial retrograding under amphibolite to green-schist facies conditions.

Asia, Plate tectonics, Magmatism, Himalaya Mountain region

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Hot-side-up aureole in southwest Yukon and limits on terrane assembly of the northern Canadian Cordillera: comment and reply

Article Abstract:

Confusion on the hypothesis regarding the tectonic environment and evolution of the Early Jurassic pluton in the Nisling terrane of the Northern Cordillera arise from the unfortunate choice of terms concerning the structure of the terrane. The term 'Nisling' was applied only to describe rocks in Stikinia, while the 'Yukon-Tanana terrane' was applied too broadly to tectonites.

Canada, Yukon Territory

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