author={J. Keith Rigby and Donald Wilkin. Boyd},
  booktitle={Journal of Paleontology},
Abstract A new small twiglike anthaspidellid sponge, Virgaspongiella ramosa new genus and species, and an incrusting lithistid sponge have been recovered from silicified residues of etched limestone blocks from the Middle Permian Franson Member of the Park City Formation in western Wyoming. Virgaspongiella n. gen. has a skeleton of upwardly and outwardly divergent trabs formed of merged tips of runglike dendroclone spicules in ladderlike series. One to a few oxeas function as coring spicules in… 

The effect of siliceous sponge deposition on Permian paleocommunity structure

A dramatic shift from carbonate-rich to chert-rich marine strata occurred during the Permian and is frequently attributed to the increased activity of siliceous sponges and their biosiliceous

Restricted morphospace occupancy of early Cambrian reef-building archaeocyaths

Abstract. The evolution of novel morphologies can signify expansion of a clade into new niches. This can be studied in the fossil record by investigating the morphospace occupancy of organisms,

Sponge meadows and glass ramps: State shifts and regime change

  • K. Ritterbush
  • Geography, Environmental Science
    Palaeogeography, Palaeoclimatology, Palaeoecology
  • 2019

Generative Design Based on Sponge Spicules' Forms

A bio-based generative design approach is proposed with an application based upon sponge spicules. The approach aims to generate new valid architectural form finding methodology through the imitation



Silicified gastropods from the Permian Phosphoria rock complex of Wyoming

This is a study of silicified gastropods from carbonate strata of the Phosphoria rock complex of Lower to Middle Permian (Leonardian-Wordian) age in Wyoming. Twenty-five collections from 13 locations

Stratigraphic implications of a Permian sponge occurrence in the Park City Formation of western Wyoming

The lithistid sponge Actinocoelia maeandrina Finks has been found recently in abundance in the Franson member of the Park City formation near Dubois, Wyoming. This new occurrence extends the range of

Lower Ordovician lithistid sponges from the eastern Yangtze Gorge area, Hubei, China

A moderately diverse assemblage of anthaspidellid demosponges has been recovered from reef-bearing carbonate platform deposits of Early Ordovician, Tremadoc to early Arenig age, in Hubei Province.

Large columnar structures hiding Skolithos grandis n. isp. In permian strata western U.S.A.

Peculiar columnar structures in Permian chert and sandstone beds in western Wyoming, southwestern Montana, northwestern Utah and northeastern Nevada occur in four distinct preservational forms. All

Paleontology and deposition of the Phosphoria Formation

The Phosphoria Formation and related rocks were deposited in an interior sag basin developed in the Cordilleran miogeocline of western North America. Deposition can be characterized as a fringing

Permian chronostratigraphic subdivisions

(shel幻 and the the (slope and corresponds 功isulina-domi- nated to Polvdiexodina-dominated fusulinacean faunas and the occurrence of the ammonoid Timorites. Recent studies on the Guadalupian/Lopingian

Biostratigraphy of the Phosphoria, Park City, and Shedhorn Formations, with a section on fish

, ________________________________________ Introduction.______________________________________ Stratigraphic setting.___________________________ Previous work..________________________________

Stratigraphy and petrology of the Permian rocks of southwestern Montana

______________________________ Introduction. ____________________________ Purpose of investigation. ______________ Personnel and acknowledgments. _ ______ Geography _______________________ Geologic

Sponges from the Early Devonian Garra Formation, New South Wales

Thirteen species of fossil sponges from limestones of the Garra Formation of late Lochkovian-early Pragian age are described, and their distribution within the lower part of the limestone is