24 Undergraduate Research (Posters)

Wednesday, 13 May 2020
9:00 AM - 6:00 PM
Fountain Ballroom

AN INVESTIGATION OF AMYGDALOIDAL BASALT IN THE CONEJO VOLCANICS FORMATION, SANTA MONICA MOUNTAINS, CALIFORNIA

Paper number: 24-34
Program: Theme Sessions
Time: 9:00 AM – 6:00 PM

Authors

Abstract

Field mapping and mineralogical analysis were conducted on several layers of the Conejo Volcanics formation that are exposed in an outcrop in Triunfo Canyon, Agoura Hills, CA. The ~200 meter-long outcrop exposes moderately north-dipping volcanic stratigraphy. The bottom layer is amygdaloidal basalt, the vesicles of which are lined with palagonite, suggesting subaerial emplacement. The next layer is a (10m-thick) pyroclastic flow deposit capped by a layer of pillow basalt. The contact between the bottom two layers is a groundwater seep from which plants grow, suggesting that bedrock has a primary control on groundwater movement in the complex Conejo Volcanics formation.

Geological Society of America Abstracts with Programs. Vol. 52, No. 4

doi: 10.1130/abs/2020CD-346911

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