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SUMMARY:The world’s least loved sedimentary structures: Sole marks as gu
 ides to flow dynamics\, substrates\, and the misidentification of life - J
 eff Peakall\, University of Leeds
DTSTART:20250527T110000Z
DTEND:20250527T120000Z
UID:TALK231055@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:Sole marks are sedimentary structures that are typically seen 
 on the base of beds and encompass a wide range of forms from flutes to gro
 oves. They are particularly prevalent in lacustrine and deep-marine sedime
 nts\, but their utility has largely been restricted to palaeocurrent infor
 mation in marked contrast to most other sedimentary structures which provi
 de information about flow conditions\, and thus environments. Whilst their
  counterparts such as ripples and dunes have remained the focus of extensi
 ve research\, almost all work on sole marks stopped more than half a centu
 ry ago. This work from the 1950s to the early 1970s left behind a series o
 f enigmatic observations on the distribution and prevalence of these diffe
 rent structures. These unloved structures are revisited here\, and these e
 nigmas addressed. It is shown that sole marks provide a wealth of informat
 ion that goes far beyond palaeocurrents. They provide information on flow 
 type\, flow transformation in space and time\, substrate conditions\, sedi
 ment bypass\, and the nature of aqueous sediment gravity flows. In turn\, 
 these findings challenge most of our previous understanding of sole marks\
 , that has stood for the past 60-70 years. Certain types of sole structure
 s\, here termed flow-induced interfacial deformation structures (FIDS)\, a
 lso produce a range of complex patterns. In turbiditic sequences these pat
 terns have in many cases been misidentified as MISS – microbially induce
 d sedimentary structures. The identification of MISS is in turn often used
  to imply shallow water conditions within the photic zone\, and consequent
 ly\, this can lead to misidentification of environments.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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