Upper lower Cambrian (provisional Cambrian Series 2) trilobites from northwestern Gansu Province, China
نویسندگان
چکیده
منابع مشابه
Tiny Sea Anemone from the Lower Cambrian of China
BACKGROUND Abundant fossils from the Ediacaran and Cambrian showing cnidarian grade grossly suggest that cnidarian diversification occurred earlier than that of other eumetazoans. However, fossils of possible soft-bodied polyps are scanty and modern corals are dated back only to the Middle Triassic, although molecular phylogenetic results support the idea that anthozoans represent the first maj...
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Secondarily phosphatised olenid trilobites from organic−rich limestones (orsten) in the Furongian (Upper Cambrian) of Västergötland, south−central Sweden, are described and illustrated. All trilobites originate from the Peltura scara− baeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become second− arily phosphatised, and the ventral appendag...
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The earliest growth of post-metamorphic (postlarval) shells in two species of Eohadrotreta is described from the Cambrian Shuijingtuo Formation of South China. Two different growth patterns can be observed by quantifying developmental variations in size and shape of successive stages of post-metamorphic shell growth (including the pedicle foramen forming stage, pedicle foramen enclosing stage a...
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ژورنال
عنوان ژورنال: Estonian Journal of Earth Sciences
سال: 2014
ISSN: 1736-4728
DOI: 10.3176/earth.2014.12