Strontium isotope, amino acid, and fossil taxonomy data to aid in identifying instances of marine terrace reoccupation on Anacapa and San Miguel Islands, California, USA

In areas of low uplift rate on the Pacific Coast of North America, reoccupation of emergent marine terraces by later high-sea stands has been hypothesized to explain the existence of thermally anomalous faunas (mixtures of warm and cool species) of last interglacial age. If uplift rates have been low for much of the Quaternary, it follows that higher (older) terraces should also show evidence of reoccupation. Strontium isotope analyses of fossils from a high-elevation marine terrace on Anacapa Island, California yield a suite of ages ranging from ~2.4-2.3 Ma to ~1.4-1.5 Ma. These results indicate that terrace reoccupation and fossil mixing on Anacapa Island could have taken place over several interglacial periods...

Categories: Data; Tags: Anacapa Island, California, Channel Islands National Park, Climatology, Geochemistry, All tags... Geomorphology, Marine Geology, San Miguel Island, Strontuim isotope geochronology, U-series dating, USGS Science Data Catalog (SDC), amino acid geochronology, last interglacial, marine terrace, paleontology, paleozoogeography, sea level, Fewer tags