Photograph from https://jillschneiderman.files.wordpress.com/2010/04/frackingdiagram.gif

1. Cyclic Production from Monterey Shale
https://www.academia.edu/31587005/Cyclic_production_from_Monterey_Shale_Breathing_Fractures_and_Low-Grade_Reservoirs
 2. Hydrocarbon Potential of the Monterey Shale
https://www.academia.edu/31587034/Hydrocarbon_Potential_in_the_Monterey_Formation_as_a_Function_of_Sedimentation_Diagenesis_and_Tectonic_History_in_the_San_Joaquin_Valley_California
​3. Carpinteria Oil Seeps
www.academia.edu/37644752/Carpinteria_Oil_Seeps_Santa_Barbara_County_California