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Title: The Cambrian Evolutionary Explosion: Novel Evidence from Fossils Studied by X-ray Tomography

The Cambrian explosion (from 542 million years to 488 million years ago) is one of the greatest mysteries in evolutionary biology. It wasn't until this period that complex organisms became commonmore » and diverse. the magnitude of the event can be understood based on the contrast between the biota and the degree of diversity of the fossils from both sides. great advances have been made in Cambrian palaeontology over the past century, especially the discovery of the well-preserved soft-bodied fauna from the Middle Cambrian Burgess Shale and the Lower Cambrian Maotianshan Shale deposits. The Cambrian side of the "Cambrian explosion" is richly illustrated and contrasts greatly with the Precambrian side. The study of these extraordinarily preserved fossil biota is extremely difficult. A major challenge is 3-D reconstruction and determining the patter of the cell organization in Weng'an embryos and their buried structures in Maotianshan Shale fossils. This talk will show that two recent technological approaches, propagation phase contrast synchrotron x-ray microtomography and microtomography, provide unique analytical tools that permit the nondestructive computational examination and visualization of the internal and buried characters in virtual sections in any plane, and virtual 3-D depictions of internal structures.« less
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Title: The Cambrian Evolutionary Explosion: Novel Evidence from Fossils Studied by X-ray Tomography
Authors:
Publication Date: 2011-06-01
OSTI Identifier: 1042465
DOE Contract Number: DE-ACO2-06CH11357
Resource Type: Multimedia
Resource Relation: Conference: APS Colloquium Series, Advanced Photon Source (APS) at Argonne National Laboratory, Argonne, Illinois (United States), presented on June 1, 2011
Research Org: ANL (Argonne National Laboratory (ANL), Argonne, IL (United States))
Sponsoring Org: USDOE Office of Science (SC)
Subject: 59 BASIC BIOLOGICAL SCIENCES ; ANTIFERROMAGNETIC MATERIALS ; CHARGE CARRIERS ; CHARGE DENSITY ; COPPER COMPOUNDS ; COPPER IONS ; CUPRATES ; DIFFRACTION ; DOMAIN STRUCTURE ; DOPED MATERIALS ; ELECTRONIC STRUCTURE ; LAYERS ; KINETIC ENERGY ; OXIDES ; SEGREGATION ; SPIN ; SUPERCONDUCTIVITY ; HIGH-TC SUPERCONDUCTORS ; Cambrian ; Fossils, X-ray Tomography
Country of Publication: United States
Language: English
Run Time: 0:56:30
System Entry Date: 2016-01-28