Palaeozoic Geography
نویسندگان
چکیده
منابع مشابه
The characters of Palaeozoic jawed vertebrates
Newly discovered fossils from the Silurian and Devonian periods are beginning to challenge embedded perceptions about the origin and early diversification of jawed vertebrates (gnathostomes). Nevertheless, an explicit cladistic framework for the relationships of these fossils relative to the principal crown lineages of the jawed vertebrates (osteichthyans: bony fishes and tetrapods; chondrichth...
متن کاملLeaf anatomy of a late Palaeozoic cycad
Today, cycads are a small group of gymnospermous plants with a limited distribution in the (sub)tropics, but they were major constituents of Mesozoic floras. Fossil leaves sporadically found in latest Carboniferous and Permian floras have putatively been ascribed to cycads. However, their true affinity remains unclear due to the lack of anatomical evidence. Virtually all modern cycads have pinn...
متن کاملEvolution of Palaeozoic ammonoid sutures
The history of the appearance and evolution of the suture, one of the major structural elements of the shells of ammonoids (a subclass of Cephalopoda), is briefly discussed. Its morphology is considered in the Devonian Anarcestida, the first members of which are very similar to the ancestral Bactritoidea, in the Late Devonian Clymeniida, the Devonian–Permian Tornoceratida, the Carboniferous–Per...
متن کاملEvidence of photosymbiosis in Palaeozoic tabulate corals.
Coral reefs form the most diverse of all marine ecosystems on the Earth. Corals are among their main components and owe their bioconstructing abilities to a symbiosis with algae (Symbiodinium). The coral-algae symbiosis had been traced back to the Triassic (ca 240 Ma). Modern reef-building corals (Scleractinia) appeared after the Permian-Triassic crisis; in the Palaeozoic, some of the main reef...
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The use of local knowledge in and for development is a relatively recent phenomenon, entering the realm of development theory and practice from the mid 1970s, yet it has become a key part of the rhetoric and practice of development agencies and academic research. The conceptual and historical background to local knowledge in development, including its roots of ‘Western’ engagement with ‘other’ ...
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ژورنال
عنوان ژورنال: The Geographical Journal
سال: 1909
ISSN: 0016-7398
DOI: 10.2307/1778005