41. Geologically, it is characterized by basalts overlying altered granite. 42. They are artesian springs arising from a fault overlying the Edwards limestone. 43. The exposed rocks include the Arenig and overlying Llanvirn series. 44. It was deposited in a nearshore environment, unconformably overlying Precambrian basement. 45. It consists of one meter of late Quaternary aeolian sediments overlying bedrock. 46. A cut bank of the creek shows of muck overlying of gravel. 47. Helium accumulations are commonly in structural closures overlying bedrock highs. 48. The overlying Shell Lake Member consists primarily of anhydrite interbedded with dolostone. 49. Overlying shales provide additional thickness for the source rocks of this system.50. Temperatures of the air overlying chilly Pacific waters are generally in the 50s.
