نتایج جستجو برای: conodont
تعداد نتایج: 287 فیلتر نتایج به سال:
An echinoderm fauna from the San Salvatore Formation (Middle Triassic, Southern Alps) is here described in detail for first time. Identifiable crinoids and echinoids were collected three different localities: Mt. (Ticino, Switzerland), Rasa di Varese Michele (Lombardy, Italy). Crinoid taxa include Encrinus cf. aculeatus, Holocrinus sp. indet., Zardinicrinus granulosus, Encrinidae gen. et indet....
This study is based on zircon U-Pb ages of 12 volcanic ash layers and volcanogenic sandstones from two deep water sections with conformable and continuous formational Permian–Triassic boundaries (PTBs) in the Nanpanjiang Basin (South China). Our dates of single, thermally annealed and chemically abraded zircons bracket the PTB in Dongpan and Penglaitan and provide the basis for a first proof-of...
Major and minor elements of successively collected 70 Middle Triassic radiolarian bedded cherts from the Mino Belt in central Japan were studied. In order to reveal pre-diagenetic, primary geochemical signatures related to marine biogeochemical cycles, composite data of chert-shale couplets in addition to raw data were examined. The results show that Mn, Cu, Sr, Ba and P were supplied significa...
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