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Unformatted text preview: “D” and nonzero “T” Computer generated gastropods using W,D,T,S More computer generated molluscs Adaptation as deviation from logarithmic growth Archimedean spiral in trace fossils The “Raup Block” • Why are certain combinations of Raup parameters uncommon? Dimensionless Raup parameters: 4 suffice to describe any pure logarithmic shell shape • W: whorl expansion rate • D: distance from coiling axis • T: translation rate down coiling axis • S: shape of generating curve Varying W • Note extension past generating curve The problem of intersecting umbos in the Bivalvia • Inherent consequences of the mode of growth force deviation from logarithmic growth Genus Arca: an example of one solution to the “umbo problem” Inherent geometric constraints and uncoiled gastropods: the Precious Wenteltrap ( Epitoneum scalare ) • T = 2(W) .5 (W-1) The Raup Block Spiral nebula...
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- Spring '11
- PARKER
- Golden ratio, Fibonacci Series, logarithmic Spiral, spiral, Raup Block
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