Origin, palaeoecology and stratigraphic significance of bored and encrusted concretions from the Upper Cretaceous (Santonian) of southern Israel
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- 作者：Mark A. Wilson (1)
Micha? Zatoń (2)
Yoav Avni (3) - 关键词：Reworked concretions ; Disconformity ; Sclerobionts ; Upper Cretaceous ; Santonian ; Israel
- 刊名：Palaeobiodiversity and Palaeoenvironments
- 出版年：2012
- 出版时间：September 2012
- 年：2012
- 卷：92
- 期：3
- 页码：343-352
- 全文大小：1127KB
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Micha? Zatoń (2)
Yoav Avni (3)
1. Department of Geology, The College of Wooster, Wooster, OH, 44691, USA
2. Department of Stratigraphy & Palaeontology, Faculty of Earth Sciences, University of Silesia, B?dzińska 60, PL- 41-200, Sosnowiec, Poland
3. Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem, 95501, Israel
文摘
Reworked concretions have been significant substrates for boring and encrusting organisms through the Phanerozoic. They provide large, relatively stable calcareous surfaces in systems where sedimentation is minimal. Diverse sclerobiont communities have inhabited reworked concretions since the Ordovician, so they have been important contributors to our understanding of the evolution of these ecological systems. Here, we describe reworked concretions from southern Israel where they are critical for interpreting the stratigraphy and paleoenvironment of an Upper Cretaceous sedimentary sequence. These cobble-sized concretions (averaging roughly 1,000?cm3) are found at the base of the Menuha Formation (Santonian to lower Campanian, Mount Scopus Group) unconformably above the top of the Zihor Formation (Turonian-Coniacian, Judea Group) exposed in the Ramon region of the Negev Highlands. The concretions are almost entirely composed of micritic limestone, and many are exhumed, cemented burrow-fills apparently from 10-0?m of upper Zihor Formation strata removed by erosion. There are also a few cobbles of dolomitic limestone and rare vertebrate bone. The cobbles are moderately to heavily bored by bivalves (producing Gastrochaenolites) and worms (forming Trypanites), and a few have cemented oysters. They are densely arrayed in a single layer, often touching each other or only a few centimeters apart. The sclerobionts associated with the cobbles, along with their hydrodynamic arrangement, strongly suggest that these cobbles accumulated in very shallow water above normal wave base. Most of them (77%) are encrusted on their top surfaces only, indicating that they were bored in place and not later delivered to a deeper environment by submarine currents. The rest of the Menuha Formation above is a chalk with relatively few macrofossils (primarily shark teeth and oysters) and a few trace fossils (Planolites and Thalassinoides are the most common). These reworked cobbles show that the initial deposits of the Menuha Formation accumulated in very shallow water. This has important implications for the development of the Syrian Arc structures in this region, especially the Ramon Monocline.