ENHANCED DATA COLLECTION METHODS OF ICHNOLOGICALLY SIGNIFICANT FIELD SITES IN SOUTHERN NEVADA THROUGH THE USE OF PHOTOGRAMMETRIC RECONSTRUCTIONS

Upon discovery of ichnological features in southern Nevada in the early 21st century, our research team completed primary data collection through the use of traditional field methodologies including, but not limited to: traditional ground-based measurements, photography of individual tracks, chalk outlines, and detailed note-taking. As technology has rapidly advanced, the precision and quality of data have vastly improved, particularly through our utilization of photogrammetric reconstructions in conjunction with traditional methods. In addition to three-dimensional models, photosets processed using Agisoft Metashape can yield digital elevation models, mm-scale surface contours, and scale production using specialized markers. These enhanced analytical tools are allowing more precise measurements to better identify not only ichnologically significant features, but also the surrounding lithologies.

The impact of shadows, field-related hazards, and the limits of daylight have made the traditional pursuit of and access to ichnological studies relatively inaccessible to many. While the workflow of capturing and producing three-dimensional models through photogrammetry has improved alongside the technological advances in software, accessibility and safety of field sites remains limited. In this study we utilize methods adapted from the photogrammetric history and methodology described by Matthews et al. (2016). The ability to preserve and easily share models of natural features has allowed enhanced interpretation and accessibility to researchers as well as the general public.

Photosets collected in southern Nevada are focused on sites reported within the Jurassic Aztec Sandstone and are also ongoing within the Miocene Muddy Creek Formation. These reconstructions are providing significant behavioral, paleoecological, and preservational context to the resurgence of life after the end-Triassic extinction as well as mega-faunal evolution in North America. We have documented approximately 20% of reported sites and work is currently continuing at additional sites.