Granodiorite Boulder from Antarctica - Menlo Park, California
Posted by: Groundspeak Premium Member saopaulo1
N 37° 27.348 W 122° 10.206
10S E 573398 N 4145760
Quick Description: A specimen from Antartica on the campus of the United State Geological Survey.
Location: California, United States
Date Posted: 7/6/2018 11:34:04 PM
Waymark Code: WMYPCX
Published By: Groundspeak Premium Member Crew 153
Views: 4

Long Description:
The rock is part of a tour on the campus. The plaque reads: “This boulder was collected in the Ross Sea during the 1984 research cruise of the USGS ship S.P. Lee. It was dredged at a depth of 2000 meters (6,500 feet) from the flank of Iselin Bank, the northern extension of a wide basement ridge 100 kilometers (60 miles) wide. It is reportedly one of the largest samples yet collected from the Antarctic continent. The composition of granodiorite is similar to plutonic rock located in the Transantarctica Mountains situated onshore 700 kilometers (450 miles) to the west. It is, however, believed to have been carved from granitic rocks on Iselin Bank itself. If so, it represents a fragment of the slab of continental crust left behind during the break-apart of Antarctica, Australia and New Zealand about 80 million years ago.”
Type of Waymark: Off Continent Point of Interest

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