Who is Gilbert, Grove K. (1843–1918) American Geologist, Geomorphologist

Grove Gilbert is well known for his concept

of graded streams. This concept maintained that streams

always make channels and slopes for themselves either by

cutting down their beds or by building them up with sediment

so that over a period of time these channels will transport

exactly the load delivered into them from above. Gilbert

also explained the structure of the Great Basin as a result of

extension, that is, individual “basin ranges” are the eroded

upper parts of tilted blocks, which were displaced along

faults as “comparatively rigid bodies of strata.” After 1862,

Gilbert received a number of awards and worked with

numerous geologists on several geological surveys. When he

studied the Henry Mountains (1875–76) he was the first to

establish the fact that intrusive bodies are capable of deforming

the host rock. He insisted that the Earth’s crust is “as

plastic in great masses as wax is in small.” Unfortunately he

exaggerated the fluidity of magma. Gilbert was conscientious

in giving credit to those who deserved it but did not pay

attention when it was given to him. From 1889 to 1892, he

was the chief geologist of the U.S. Geological Survey.

glacial system See GLACIER.

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