Paulina Marsh, Oregon Tephra Dataset

This data collection describes tephra samples collected from core OSU-PMOR1907-7GP-1WPAUL-OR19-7-2G as part of a multi-proxy paleoenvironmental study of sediments at Paulina Marsh, Oregon designed to help constrain human-environmental dynamics in the northern Great Basin, U.S.A.

Six stratigraphic intervals of the core were sampled for primary or reworked tephra. A metadata spreadsheet, photographs, and core logs included in this data collection document the samples and their context.

Tephra analysis was conducted at Concord University. Resulting tephra glass geochemistry, grain size measurements, scanning electron microscopy (SEM) images, SEM image metadata, and sample preparation metadata are included in this collection.

Tephras identified among the samples include Cy from Mt. St. Helens (GVP vnum 321050) and the Paulina Creek tephra of Newberry Volcano (GVP vnum 322110). These are also known respectively as the Marble Bluff and Olema distal ash beds and occur in multiple samples. A >= 7 cm thick tephra layer containing coarse ash and fine lapilli yielded geochemistry which could not be definitively correlated to a specific known eruption and source volcano but does bear similarity to some tephras of Newberry Volcano.