Plants invade the land: evolutionary and environmental by Patricia G. Gensel, Dianne Edwards

By Patricia G. Gensel, Dianne Edwards

What will we find out about the origins of crops on land, from an evolutionary and an environmental standpoint? The essays during this assortment current a synthesis of our current nation of information, integrating present info in paleobotany with actual, chemical, and geological information.

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1995). Wright and colleagues suspected the arthropleurid Eoarthropleura of being the maker of the Newfoundland trackway, a contention strengthened by the discovery of Eoarthropleura body fossils in the Lower Devonian of New Brunswick (Shear et al. 1996) and the Upper Silurian of Shropshire, England (Shear and Selden 1995). However, their argument was based on the anatomy of the leg tip of the much later (Carboniferous) Arthropleura, and recently discovered material of the legs of Eoarthropleura show a strikingly different structure.

1992; Stephenson and Scott 1992) and growing (Labandeira and Phillips 1996). Body Fossils This evidence is organized chronologically and by fossil site. In subsequent sections, the major groups of animals will be treated in more detail as to their mode of life and ecological role. Body fossils of Silurian and Devonian land animals occur in two preservational contexts: as organically preserved cuticle that can be extracted from the matrix using hydrofluoric acid (HF) maceration (Shear et al. 1984; Jeram 1994a; Braun 1997), and as impression fossils.

Dracochela is not very different from modern neobisioid pseudoscorpions and undoubtedly had a similar lifestyle. Acari The earliest mite fossils are specimens from the Rhynie Chert (Hirst 1923). Originally placed in but a single species, they may actually represent as many as four distinct families (Dubinin 1962) but require detailed reexamination (Norton et al. 1988). Two oribatid mites (Norton et al. 1988) and one alicorhagiid (Kethley et al. 1989) have been discovered at Blenheim-Gilboa. A few poorly preserved specimens of oribatids similar to one of the Gilboa oribatid families (Devonacaridae) have been recovered from the younger South Mountain site.

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