Journal
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Volume 172, Issue 3-4, Pages 171-191Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0031-0182(01)00268-1
Keywords
Pectinidae; coquinas; taphonomy; deepening-upward sequences; Burdigalian; Egypt
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The Early Miocene (Burdigalian) section at Gebel Gharra (SW Suez, Egypt) represents a mixed carbonate/siliciclastic regime and is composed of a series of fining- and deepening-upward sequences. Mass occurrences of scutellid echinoids and pectinid bivalves are remarkable features within this section. Five pectinid horizons, occurring in two superpositioned fining-upward sequences, are qualitatively and quantitatively studied in detail. The taxonomic composition of respective pectinid accumulations clearly support a deepening-upward interpretation with decreasing pectinid diversity, decreasing convexity, shell thickness, and sculpturing. The taphonomic parameters of the pectinid beds, in combination with the study of co-occurring biota and frequency and density of shell encrustations and bioerosion, clearly point to different mechanisms for shell accumulations, namely as 'composite concentrations' and 'reworked event-concentrations'. (C) 2001 Elsevier Science B.V. All rights reserved.
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