Paleoecology of Cyclocrinites darwini (Miller) - a cyclocrinitid alga from the Cincinnatian series (Upper Ordovician)
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چکیده
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Evaluating paedomorphic heterochrony in trilobites: the case of the diminutive trilobite Flexicalymene retrorsa minuens from the Cincinnatian Series (Upper Ordovician), Cincinnati region.
Flexicalymene retrorsa minuens from the uppermost 3 m of the Waynesville Formation of the Cincinnatian Series (Upper Ordovician) of North America lived approximately 445 Ma and exhibited marked reduction in maximum size relative to its stratigraphically subjacent sister subspecies, Flexicalymene retrorsa retrorsa. Phylogenetic analysis is consistent with the notion that F. retrorsa retrorsa was...
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Although parasequence and sequence are scale-independent terms, they are frequently applied only to specific scales of cycles. For example, meter-scale cycles are commonly assumed to be parasequences or PACs. In the Upper Ordovician Kope and Fairview Formations of northern Kentucky, we examined a succession of 50 meter-scale cycles that have been variously interpreted as deepening-upward, shall...
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ژورنال
عنوان ژورنال: The Paleontological Society Special Publications
سال: 1992
ISSN: 2475-2622,2475-2681
DOI: 10.1017/s2475262200007371