Background to the Cambrian explosion

Article Abstract:

A meeting was held to examine situations surrounding the 'Cambrian explosion.' The Geological Society, the Paleontological Assn and IGCP Project 303 were among the co-sponsors of the Lyell Meeting. Although much data was generated for the conference, the participants failed to establish a link between the evolutionary explosion and extrinsic factor variations. However, the meeting established the need for a working chronostratigraphy and the question of a link between discussed phenomena and Precambrian continental breakup.

Conferences, meetings and seminars, Geological research

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Early Cambrian continental reconstructions

Article Abstract:

A reconstruction of the early Cambrian period is presented and analyzed. The model was developed by combining climatically-related sedimentary facies and faunal distributions with paleomagnetic data. It is shown that a continental group composed of Laurentia, Baltica and Siberia separated from each other before 600 Ma. Gondwana possibly formed before the Cambrian. Arhcaeocyathan reefs imply that Siberia, southern Euroep and Morocco were adjacent to each other in low altitudes.

Facies (Geology), Geologic facies

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Nutrient-enriched waters and the early skeletal fossil record

Article Abstract:

A study was conducted to evaluate the impact of stratified, oxygen-depleted and nutrient-enriched water masses (NEW) on the Precambrian-Cambrian fossil record. Results show that several variables mark the encroachment of NEW over low-latitude cratons. Such variables include trace-element enriched black shales, 'stone coals' and hydrocarbon source rocks, phosphorites, phosphatized shells and organic material and early silica and phosphatic skeletons.

Evaluation, Culture media (Biology), Culture media, Fossils, Burgess Shale, Precambrian Era

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