Ripple marks as indicators of Late Ordovician sedimentary environments in Northwest Estonia
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چکیده
منابع مشابه
Facies, sedimentary environments and sequence stratigraphy of Cretaceous deposits in the northwest of Azerbaijan, Iran
The Cretaceous deposits in Morakan, located in the northeast of Khoy, a town in western Azerbaijan province, Iran, are primarily made up of carbonate rocks. These deposits, which are of 717 meters thick, lie on the clastic facies of Jurassic and are covered with beneath the pelagic beds of the Upper Cretaceous. To investigate the facies, sedimentary environment and sequential stratigraphy of th...
متن کاملThe Earliest Giant Osprioneides Borings from the Sandbian (Late Ordovician) of Estonia
The earliest Osprioneides kampto borings were found in bryozoan colonies of Sandbian age from northern Estonia (Baltica). The Ordovician was a time of great increase in the quantities of hard substrate removed by single trace makers. Increased predation pressure was most likely the driving force behind the infaunalization of larger invertebrates such as the Osprioneides trace makers in the Ordo...
متن کاملstudy of late permian (wuchiapingian) brachiopods of sedimentary succession at the zal section, northwest iran
julfa beds at zal section, northwest iran, with 33 meter thickness, are composed of gray, cream to red limestones, nodular in some parts with intercalations of green, gray to red shales. they are very important because they are very rich in the late permian brachiopod. this research, which is focused on the mentioned fauna from the zal section, is led to identification of 38 species of 21 gener...
متن کاملThe first report of cryptospore assemblages of Late Ordovician in Iran, Ghelli Formation, Eastern Alborz
For the first time, an assemblage of cryptospores, which includes 10 species belonging to nine genera, from the Upper Ordovicianstrata, is being reported, in Iran. These cryptospore assemblages were recovered from the upper part of Ghelli Formation., from theeastern Alborz Mountain range. These peri-Gondwanan cryptospores have been classified based on their morphology (monad, truedyad, pseudody...
متن کاملBioerosion of Inorganic Hard Substrates in the Ordovician of Estonia (Baltica)
The earliest bioeroded inorganic hard substrates in the Ordovician of Estonia appear in the Dapingian. Hardgrounds are also known from the Sandbian and Katian. Most of the bioerosion of inorganic hard substrates occurs as the boring Trypanites Mägdefrau, 1932 along with some possible Gastrochaenolites borings. North American hardground borings are more diverse than those in Baltica. In contrast...
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ژورنال
عنوان ژورنال: Estonian Journal of Earth Sciences
سال: 2008
ISSN: 1736-4728
DOI: 10.3176/earth.2008.1.02