Late Precambrian Trace Fossils From New South Wales

Abstract

Seven trace‐fossil species are described from the upper part of the Torrowangee Group (Upper Proterozoic) of western New South Wales, and a variety of other traces are illustrated. A few forms occur in the Fowlers Gap Beds, and a more diverse and abundant fauna is recorded from the stratigraphically higher Lintiss Vale Beds. Virtually all the traces are preserved in the plane of bedding, as semi‐reliefs. The named trace fossils all come from the Lintiss Vale Beds, and are as follows: Planolites ballandus sp. nov., Planolites? sp., Cochlichnus serpens sp. nov., Gordia? sp., Torrowangea rosei gen. et sp. nov., Phycodes? antecedent sp. nov., and Curvolithus? davidis sp. nov. Three of these species are regarded as feeding burrows (endogene), and are thought to represent the activity of infaunal, worm‐like deposit feeders. Others may be either feeding burrows or crawling trails. There are also a few impressions which seem to be rest marks. A discussion of the significance of the trace‐fossil occurrences is presented.

Pioneer organisms after F-F mass extinction in Dushan region, Guizhou Province, and their significance in establishing new ecosystem

“…In stratigraphic sequence, these trace fossils show a clear evolutionary tendency that the burrows enlarged in diameter gradually, the structures become continuously complicated, the muscle systems became more developed, the living and moving area and space were extended from linear to planar and then to three-dimensional, and their ability deforming deposits and efficiency of looking for food were enhanced obviously. This process is similar to that noticed around the Precambrian-Cambrian [39,[48][49][50][51][52][53][54][55][56][57][58] , and may be closely related to the changes in environmental factors. Gong et al [59][60][61] suggested one of that the causes for the F-F mass extinction might be related to the abnormal propagation of marine plankton algae.…”

Ichnofossils and their significance in the Cambrian successions of the Parahio Valley in the Spiti Basin, Tethys Himalaya, India

“…Alpert (1975) have given a detailed analysis of the Planolites. The specimen differs with the Planolites balandus; Planolites serpenes Webby (1970) and with the Planolites reticularis Alpert (1975) in the diagnostic characters. The specimen somewhat resembles with Planolites corrugates Walcott (1889) in its outer features, but differs with it in the length and width ratio.…”

Ichnostratigraphy of the Ediacaran-Cambrian boundary: new insights on lower Cambrian biozonations from the Soltanieh Formation of northern Iran

“…Remarks.-Thirteen ichnospecies of Phycodes have been described in the literature, based on their overall pattern and size, nature, style, disposition and degree of branching, and presence or absence of spreite (Han and Pickerill, 1994): P. antecedens Webby, 1970; P. auduni Dam, 1990; P. bromleyi Dam, 1990 Hofmann, 1979;P. ungulatus Fillion and Pickerill, 1990;and P. wabanensis Fillion and Pickerill, 1990.…”