Burgess Shale-type faunas in the context of the "Cambrian explosion:" a review

Article Abstract:

An analysis of Burgess Shale-type faunas is presented. It is shown that such animals have inhabited about 40 lower and middle Cambrian localities. British Columbia (Canada), Yunnan (China) and Peary Land (Greenland) showed the most vital animal forms. These Cambrian animals exhibited surviving taxa from late Precambrian Ediacaran lineage, possibility of variation in scleritome organization for some Cambrian skeletal taxa and a significant level of diversity in anatomy among such fauna.

Burgess Shale

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Ion-probe dating of a mid-Early Cambrian tuff in South Australia

Article Abstract:

U, Pb, and Th isotopic analyses of zircons from the Heatherdale Shale of Sellicks Hill in South Australia were made to determine their position in Early Cambrian time. Trilobite and archaeocyath fossils above and below the tuff layer concerned indicate that it is late Atdabanian or Botomian (around 526 million years), thus predating the Delamerian Orogeny. Turbiditic sedimentation succeeds the Heatherdale Shale as a result of initial Delamerian movements.

Australia, Usage, Natural history, Zircon, Microprobe analysis

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A simple magma-mixing model for sulphur behavior in calc-alkaline volcanic rocks: mineralogical evidence from Mount Pinatubo 1991 eruption

Article Abstract:

A model describing sulphur behavior based on mineralogical evidence from the eruption of Mt Pinatubo in the Philippines is presented. It is shown that an increasing recognition of anhydrite as primary magmatic material implies the need to develop sulphur sources from the upper mantle. Sulphur is supersaturated in calc-alkaline interactions because of the mafic end member's quenching and oxidation.

Models, Sulfur, Magmatism, Mount Pinatubo

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