318


Journal of Paleontology 92(3):313–322


Figure 4. Photographs of Dickinsonia costata Sprigg 1947 from the Crisp Gorge fossil locality, Flinders Ranges (latex rubber casts). (1) Well-defined, non-continuous shrinkage rim and A-end lip, SAMP34235; (2) well-developed A-end lip present as narrow, high relief band in A-end units, SAMP34228; (3) continuous shrinkage rim visible around entirety of body, SAMP34243; (4) A-end lip visible on right side of body distorting perimeter of A-end units, SAMP32351; (5, 6) displaying continuous, uneven shrinkage rims SAMP34224, SAMP34219; (7, 8) A-end protuberance present as a bold, high relief structure encompassing terminal A-end units and involving subsequent A-end units, SAMPP34232, SAMP34254; (9) A-end protuberance and shrinkage rim, SAMP34326. Scale bars=5mm.


Clapham et al., 2004 and fronds, including Charnia Ford, 1958 have been demonstrated to have been manipulated by the uni- directional current flow at the time of their burial, effectively recording current direction of the burial flow with their final resting position (Wood et al., 2003; Clapham et al., 2004; Wilby et al., 2011). Recent evidence of rheotaxis in Parvancorina


suggests that an active response to current flow was employed, with individuals demonstrated to align with the current within two different paleoenvironments, most likely to minimize drag and ensure that current flow was directed over feeding structures (Paterson et al., 2017; Darroch et al., 2017). The absence of current alignment in Dickinsonia may be due in part to its


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