Today’s trip traverses a nearly east-west swath of the southern Colorado Plateau in northeatern Arizona (Fig. 2.1), where the low and barren topography is developed in Permian and Triassic sedimentary rocks. Here, our focus is on the Lower-Middle Triassic Moenkopi Formation. In northern Arizona, east of Flagstaff, the Moenkopi section (Fig. 2.2) is a relatively thin (< 150 m thick) and almost e...

Microfossils resembling fecal pellets occur in acid-resistant residues and thin sections of Middle Cambrian to Early Proterozoic shale. The cylindrical microfossils average 50 x 110 mum and are the size and shape of fecal pellets produced by microscopic animals today. Pellets occur in dark gray and black rocks that were deposited in the facies that also preserves sulfide minerals and that repre...

in Antarctic fossil forests: evolutionary and palaeoclimatic significance" (2007). Related Publications from ANDRILL Affiliates. Paper 4. Summary Many collections of Eocene Fossil leaves from Antarctica contain a rich store of insect trace fossils, indicating that insects were an important component of the unique forests that grew in polar regions. However, insect body fossils themselves are ra...

The nine-banded armadillo (Dasypus novemcinctus) is a well known burrower, but individuals spend the majority of their time above ground foraging for soil organisms by repeatedly digging pits through the soil surface. Little ichnological attention has been given to these foraging pits even though their great prevalence within the geographic range of extant armadillos implies that they might hav...

A new assemblage of large insect trace fossils is recognized in paleosols the middle Miocene pyroclastic deposits from extra-Andean north Patagonia. This includes Racemusichnus jacobacciensis igen. isp. nov., largest fossil attributed to solitary insects. R. represented by clusters two seven thickly walled cylinders horizontally orientated paleosol. The cluster arrangement, its orientation, siz...

Trace element analysis of fossil bone and enamel constitutes a useful tool to characterize the paleoecological behavior of mammals. Up to now, most trace element studies have focused on Plio-Pleistocene fossils. Here, we show that paleodietary inferences based on trace element analyses can be also obtained from ~14Ma old Miocene mammals, in a period of time when important paleoclimatic changes ...

The Precambrian to Cambrian strata at the southwestern margin of Siberian Platform are ubiquitously characterized by a gradual transition from red-colored alluvial and deltaic deposits shallow-marine carbonates, reflecting transgressive infill accommodation space foreland basin. However, supposed synchronicity Early marine events calls for verification geochronological bio- chemostratigraphic d...

Trace fossils are the only direct record of the behavior of ancient organisms. They thus provide critical indications of the early evolution of sensory systems and of the behavioral response to environmental heterogeneity. An important category of traces preserve the foraging behavior of organisms on or just below the seafloor. Previous conceptual and numerical models of such traces have been b...