Biostratigraphy and biogeography of Frasnian, Upper Devonian conodonts
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Conodonts and Biostratigraphy of Upper Ordovician Strata along a Shelf to Basin Transect in Central Nevada
Conodonts representing 38 species of 26 genera have been identified in samples from Upper Ordovician rocks at three central Nevada localities. Ranges of these species and associated graptolites are used graphically to determine correlation of the strata considered with an evolving composite standard that includes information from Ordovician strata at more than 100 localities in North America. R...
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Among the oldest convincing fossils of early vascular land plants are those of the Division Rhyniophyta. The members of this division consist of: (1) simple axes with cuticle, stomates, epidermis, cortex and a terete (circular) centrarch xylem (xylem development occurs from the center of the stem to the periphery), without well-developed appendages or roots; (2) simple, isotomous branching syst...
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ژورنال
عنوان ژورنال: The Paleontological Society Special Publications
سال: 1992
ISSN: 2475-2622,2475-2681
DOI: 10.1017/s2475262200007267