X-Ray Microanalysis of Burgess Shale and Similarly Preserved Fossils

  • Orr P
  • Kearns S
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Abstract

A theoretical ecospace is a multi-parameter system for classifying the ecological properties of organisms; because they are viewed in terms of their ecological and functional capabilities, morphologically and phylogenetically disparate organisms can be compared and contrasted. In the ecospace used here, marine animals are classified according to three parameters that can be determined relatively easily from fossils: tiering (position relative to the sediment-water interface), motility level, and feeding mechanism. Analyses of faunas from the Ediacaran, Cambrian, and Recent suggest that the ecological richness (number of ecological lifestyles) of the marine fauna rose through time, although the pace of increase slowed after the early Phanerozoic. However, the Ediacaran biota was quite distinct from Phanerozoic faunas in terms of which tiers, motility levels, and feeding mechanisms were employed; thus, the rise to dominance of bilaterians during the Cambrian Explosion caused a fundamental transformation in marine ecology. Changes in marine animal ecology since the Cambrian Explosion were of lesser magnitude.

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Orr, P. J., & Kearns, S. L. (2011). X-Ray Microanalysis of Burgess Shale and Similarly Preserved Fossils (pp. 271–299). https://doi.org/10.1007/978-94-007-0680-4_11

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