The Cambrian time scale is in a state of flux due to lack reliable geochronological dates which can be tied biostratigraphic scales. Most recent Australian relevant the geochronologic have been determined from Early successions South Australia and Middle Late sedimentary volcanic rocks western Tasmania. This work has based on SHRIMP using zircon standard SL13. reliability these questionable dou...

The early Paleozoic Terskey Suture zone, located in the southern part of Northern Tien Shan domain Kyrgyzstan, comprises tectonic slivers dismembered ophiolites and associated primitive volcanics deep-marine sediments. In Lake Songkul area, early-middle Cambrian pillow basalts are crosscut by Songkultau intrusion coarse-grained gneissose quartz diorites tonalites with geochemical characteristic...

Here we report exceptionally preserved non-biomineralized compound eyes of a non-trilobite arthropod Cindarella eucalla from the lower Cambrian Chengjiang Lagerstätte, China. The specimen represents the oldest microanatomical evidence confirming the occurrence of highly developed vision in the early Cambrian, over 2,000 ommatidia in each eye. Moreover, a quantitative analysis of the distributio...

Tlusty’s topological analysis of the genetic code suggests ecosystem changes in available metabolic free energy that predated the aerobic transition enabled a punctuated sequence of increasingly complex genetic codes and protein translators. These coevolved via a ‘Cambrian explosion’ until, very early on, the ancestor of the present narrow spectrum of protein machineries became evolutionarily l...

Kullingia is considered a key taxon in demonstrating the presence of terminal Proterozoic–early Cambrian chondrophorine hydrozoans. However, Kullingia concentrica from the Lower Cambrian of northern Sweden possesses several features that show that it is not a body fossil but that it was formed by current or wave-induced rotation of an anchored tubular organism, possibly a sabelliditid. A scratc...

Recent geological work in south-west Tasmania on a regional scale has allowed the compilation of existing information regarding Lower Palaeozoic unconformities, namely the description of new localities and in some cases the amplification and extension of previously described exposures. Carey and Banks (1954, p. 245) provide a review of information to 1954 and their classification of unconformit...

The first arthropod trackways are described from the Middle Cambrian Burgess Shale Formation of Canada. Trace fossils, including trackways, provide a rich source of biological and ecological information, including direct evidence of behaviour not commonly available from body fossils alone. The discovery of large arthropod trackways is unique for Burgess Shale-type deposits. Trackway dimensions ...