Friday Field Foto #83: Cross-stratified volcanogenic sands
This week’s Friday Field Foto is from Kilbourne Hole in southernmost New Mexico — very close to El Paso, Texas. This was my last field trip as a student back in 2007 — see more photos from that trip here.
Kilbourne Hole is a maar volcano, which (I remember correctly) is an explosive eruption of mostly gas and steam. The volcano-lovers reading this should feel free to comment below correcting me or sharing more.
This feature is a very cool place to visit as a sedimentologist because the ejecta deposits are from pyroclastic density currents. The ‘base surge’ deposits shown above are extensivly cross-stratified. I also like how this outcrop shows the three dimensionality of the cross beds.