Discovery of the Late Devonian Famennian stromatolites in the eastern Anti-Atlas, Morocco, North Africa
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摘要: 北非摩洛哥小阿特拉斯东段Fecht 地区的晚泥盆世地层划分为ds3 和dh 两个单元。ds3 单元是一套厚约1.3m的灰色夹紫红色厚-薄层瘤状生屑灰岩，发育叠层石，产丰富的海百合茎和头足类，局部伴生腕足和三叶虫。dh 单元下部为灰色薄层泥质粉砂岩与粉砂质页岩互层，夹泥灰岩透镜体；上部为灰绿色中层细砂岩，发育波痕构造，产遗迹化石和双壳类。牙形石生物地层表明这两个单元都处于法门期早Palmatolepis marginifera 带。本文首次报道了摩洛哥晚泥盆世法门期的叠层石，说明弗拉期-法门期生物灭绝事件发生后，微生物首先出现繁盛，随后才开始骨骼生物的复苏。Abstract: The Late Devonian strata at Fecht area in the eastern Anti-Atlas, Morocco, North Africa, could be divided into two units: ds3 and dh. The ds3 unit is a set of gray with purple-red thick to thin layered nodular detrital limestone with a thickness of about 1.3m, where stromatolites are observed, rich in crinoid stems and cephalopods, and locally associated with brachiopods and trilobites. The lower part of the dh unit is an interbedded layer of gray thin layer of argillaceous siltstone and silty shale, mixed with muddy limestone lenses; the upper part is a gray-green medium layer of fine sandstone, with ripple structures and abundant trace fossils and bivalves. The conodont biostratigraphy indicates that both units should be located in the Early Palmatolepis marginifera zone of the Famennian. This article reports on the stromatolites of the Late Devonian Famennian in Morocco for the first time, indicating that after the Frasnian-Famennian mass extinction, microorganisms flourished first and then followed by the recovery of skeletal organisms.
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Key words:
- stromatolite /
- conodont /
- Famennian /
- Late Devonian /
- eastern Anti-Atlas /
- Morocco, North Africa
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