Paper No. 30-4
Presentation Time: 8:00 AM-12:00 PM
THE BIOTA OF THE CAMBRIAN WEEKS FORMATION LAGERSTäTTE, HOUSE RANGE, UTAH
Recent fieldwork has expanded knowledge of the fauna from the Cambrian (Guzhangian Stage) Weeks Formation. The thin-bedded lime mudstones interbedded with shales yield rare soft-bodied fossils in the shaley partings, as well as well-preserved, articulated trilobites. Within the lime mudstones, there is a diverse shelly fauna dominated by trilobites and inarticulate brachiopods. The non-trilobite arthropod fauna is composed about 20 species (almost 40 with agnostids) and includes aglaspidids sensu lato, anomalocaridids, bradoriids, ‘megacheirans’, and several taxa of uncertain affinities. The non-arthropod fauna has become significantly more diverse with the discovery of new lophotrochozoans and several species of sponges.