Abstract
Studies on shape changes in deformed Oncograptus upsilon combined with strain analysis of pressure shadows around framboidal pyrite revealed that a small volume change of the order of 5 percent accompanied the cleavage development in the shales from Gisborne, Victoria. Starting from the proximal end, Oncograptus upsilon exhibits progressive increase in the spacing between successive thecae along the stipes. A new technique utilizing the distance between a specific number of thecae is used for computing the change in length along stipes of Oncograptus upsilon. The low volume change, accompanying a more than 70 percent shortening deformation, indicates that there is a less significant mass loss during cleavage development than has been inferred from some studies on volume change from thecal spacing in deformed graptolites.
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