Zobrazeno 1 - 10
of 52
pro vyhledávání: '"James C. Brower"'
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 87:16-43
The Dunleith Formation echinoderms lived on a shallow water carbonate platform (Benthic Assemblages outer 2 and 3 during the latter part of the Dunleith Regressive Cycle). The echinoderms were buried rapidly by storms or a volcanic ash bed in one exa
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 85:369-391
The Walcott-Rust Quarry echinoderm fauna lived at the base of a carbonate ramp in moderately deep water (Benthic Assemblage 5 of Boucot and others) below wave base for all or most storms but within the photic zone. The inhabitants of the soft substra
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 84:626-645
The camerates, Pycnocrinus argutus (Walcott, 1883) and Rhaphanocrinus subnodosus (Walcott, 1883), are characterized by narrow food grooves. An open distal stem coil was present in P. argutus, and R. subnodosus may have possessed the same type of hold
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 82:576-584
Three crinoids are known from the Upper Ordovician Hatter Limestone at Union Furnace in central Pennsylvania, i.e.,Haptocrinus buttsin. sp., an unknown crinoid with a lichenocrinid holdfast, and an indeterminate columnal that probably belongs to a cr
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 82:57-77
locrinus trentonensisWalcott, 1883 is characterized by the widest food grooves and the largest covering plates of any of the Walcott-Rust Quarry crinoids, which indicates that the animal captured relatively large food particles with large and widely
Autor:
James C. Brower, Ines Otz, Scott D. Samson, Nicholas A. Azzolina, Donald I. Siegel, Martin H. Otz
Publikováno v:
Wetlands. 27:884-893
We report the results of a detailed 12-month study of 23 freshwater wetlands and one larger synoptic characterization of 55 freshwater wetlands to test whether a hydrogeomorphic (HGM) classification of the wetlands into lotic (attached to streams) an
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 81:1284-1300
Food gathering of some adult Upper Ordovician crinoids was modeled by means of filtration theory. The arm-branching patterns of the 13 species examined range from nonpinnulate isotomous arms to uniserial and biserial arms with numerous pinnules. Most
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 81:103-115
The Platteville crinoid fauna of northeastern Iowa consists of six species: Abludoglyptocrinus charltoni (Kolata, 1975), Carabocrinus sp. Kolata, 1975, Cupulocrinus plattevillensis Kolata, 1975, Ectenocrinus simplex (Hall, 1847), Merocrinus britonens
Autor:
James C. Brower
Publikováno v:
Journal of Paleontology. 80:430-446
The growth of the food-gathering systems of Ordovician crinoids illustrates the solutions evolved to avoid or minimize problems of suspension feeding and maintenance. The column has low metabolic requirements and may even be self-sufficient; little o