Identity elements
Reference code
Name and location of repository
Level of description
Item
Title
D53468-40
Date(s)
- 1950-10-12 (Creation)
Extent
Name of creator
(1919-1980)
Content and structure elements
Scope and content
Scenic views from Eastern Washington. Volcanic activity sent clouds of ash and dust from the earth's interior and molten lava flowed out of cracks in the earth's surface during early geologic epochs of the Tertiary period. The flows of lava, also called basalt or trap-rock, cooled and shrank into five and six-sided columns. Most of each flow is a dense fine-grained rock, but the upper part is sponge-like due to gas bubbles in the molten rock. The man on top of one of the columns on the left gives some scale to these rocks. (Grand Coulee from "Hell to Breakfast", Fred O. Jones)
Rock formations; Volcanic rock;