Kaci Kus: Class of 2018
Kaci, hailing from Massachusetts, spent a 3+ week field season in June 2017 at one of the critical localities at which the South African vertebrate-defined Permian–Triassic boundary section is exposed. She and field partner, Sam Sinkler ’18, documented the stratigraphy through an erosional gully (donga) exposure on the Quaggasfontein and Piernarbaakken farms near Old Lootsberg Pass, Eastern Cape Province. Here, Kaci measured and described a 70 m thick succession of late Permian rocks reported to transition the vertebrate-defined extinction boundary, and is now in the process of analyzing her samples. In addition to thin-section characterization, she is undertaking elemental (Carbon, Hydrogen, Nitrogen) analyses of the fine-grained rocks (siltstone) and major-element analysis using X-Ray Fluorescence. She is testing several hypotheses concerning siltstone color, the presence and development of calcareous ancient soils (Calcisols), and the nature of the purported PT event interval. She will present her research results at the national GSA meetings in Seattle in October 2017. Kaci is a double major in Geology and Studio Art.
Sam Sinkler: Class of ’18
Sam came to Colby as a cross country skier and runner from Minnesota, eh. Sam is a double major in Geology and Government, but prefers the great outdoors to a conference room. Sam’s project is focused on a succession of rock near Lootsberg Pass, Eastern Cape Province, that is reported to represent environments following the end-Permian extinction in the early Triassic. These rocks, dominated by thick sandstone bodies interbedded are different in their character from Kaci’s interval where siltstone color is primarily reddish-gray. Several intervals preserve the trace fossil Katbergia, which Gastaldo and Rolerson ’06 (2008) interpreted as occurring in soils. Sam is testing whether this invertebrate burrow type also can be found in other settings. In addition, there is a thick interval in which several soils horizons are found permeated by large vertebrate burrows. Sam is using the same techniques in his analysis as Kaci, and will present his research results at the national GSA meetings in Seattle in October 2017.