Makapansgat Limeworks stratigraphy and the singular case of Member X

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dc.contributor.author Lathan, Alf
dc.contributor.author Warr, Ginette
dc.date.accessioned 2014-02-18T07:35:53Z
dc.date.available 2014-02-18T07:35:53Z
dc.date.issued 2008-04
dc.identifier.issn 0078-8554
dc.identifier.uri http://hdl.handle.net10539/13802
dc.description.abstract Within the infilling sequence of the western Limeworks a newly recognized unit, Member X, lies stratigraphically between the Member 1 massive speleothem and the Member 2 red silts. Member X consists firstly of a subaqueous mammillary layer that is ubiquitous to the whole of the Limeworks. It is succeeded by a series of intercalated clastic sediments and calcite-rich layers that is confined to the area between the Original Ancient Entrance and the Classic Section and which is terminated by a second subaqueous carbonate layer. The evidence suggests that surface sediments were washed into a carbonate-rich pool created by seepage water and, from the presence of several articulated skeletons, the Original Ancient Entrance during this phase appears to have acted as an animal trap. There are a few blocks of Member X to be found in the Limeworks dumps that have been placed in the Member 2 rows but which should be prepared separately. From the evidence of the intercalated carbonate and clastic layers it appears that Member X was deposited slowly at first and then speeded up probably because erosion caused retreat of the entrance. Member X has several unusual features including a unique pseudo-breccia layer of co-deposited calcite-mud formations, deposition of aragonite that increases with height, and calcite-aragonite layers that invert the stratigraphy on overhanging walls and ceilings but not on the floors. en_ZA
dc.language.iso en en_ZA
dc.publisher Bernard Price Institute for Palaeontological Research, University of the Witwatersrand en_ZA
dc.subject Makapansgat en_ZA
dc.subject Member X en_ZA
dc.subject stratigraphy en_ZA
dc.subject chronology en_ZA
dc.subject Kitching en_ZA
dc.title Makapansgat Limeworks stratigraphy and the singular case of Member X en_ZA
dc.type Article en_ZA


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