Graptolite rhabdosomes display a diverse suite of morphologies. The range of morphotypes present within most moderate to high diversity assemblages from the Ordovician and Silurian is similar, despite the different taxonomic composition of the faunas at different times. Survivorship analyses of graptolite faunas from the Ordovician and Silurian demonstrate strong similarities in the mortality r...

Abstract Machaeridians are armoured annelids that were morphologically diverse during the Palaeozoic. The scleritome developed from fleshy protrusions at base of each parapodium, with alternating segments giving rise to differentiated inner and outer shell plates. elytra‐like anatomy shell‐bearing soft tissues distinctive jaw apparatus support an affinity machaeridians aphroditacean scaleworms....

The position of South China in Gondwana remains controversial. In all previous models, the Yangtze and Cathaysia blocks, two major components China, were amalgamated by Tonian, was considered to be a single coherent block Gondwana. Based on summary critical reevaluation available paleomagnetic, paleontological, stratigraphic, detrital zircon data, we propose that blocks not juxtaposed until ear...