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May 21, 2012

Monday Geology Picture: R/V Roger Revelle in Port in Woods Hole

I spent two months (early June – early August) aboard the R/V Roger Revelle during an expedition to the Ninetyeast Ridge in the Indian Ocean. Although the R/V Revelle is a Scripps Institution of Oceanography┬áresearch vessel, during the summer of 2008 the ship spent some time in Woods Hole, MA on the dock owned by the Woods Hole Oceanographic Institution. I was very happy to see the ship and the …

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April 2, 2012

Monday Geology Picture: Ferromanganese-Encrusted Boulder from the Ninetyeast Ridge, Indian Ocean

Two weeks ago I posted a picture of a fragment of boytroidal ferromanganese crust that was dredged from the Ninetyeast Ridge in the Indian Ocean. Today I thought I would share a few pictures of a ferromanganese-encrusted boulder that was recovered from the Ninetyeast Ridge during the same 2007 expedition. Ferromanganese crusts actually caused some trouble for our rock descriptions. Before we could identify many rocks, we had to chip …

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March 20, 2012

Monday Geology Picture: Botryoidal Ferromanganese Crust from the Ninetyeast Ridge, Indian Ocean

For this week’s geology picture, I thought I would share a picture of a neat botryoidal (grape-like texture) ferromanganese crust that was recovered during dredging along the Ninetyeast Ridge in the Indian Ocean in 2007. Ferromanganese crusts and nodules are commonly deposited in the ocean. They often form botryoidal shapes, such as the example above.

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November 24, 2010

Geology Word of the Week: D is for Dredge

A dredge, Indian Ocean, Summer 2007. def. dredge: 1. (verb, definition 1) Removing sediments or other material from one area and depositing them in another area, usually done in a lake or other body of water. For example, harbors and canals are often dredged to removed accumulated sediments so that the water remains deep enough for ships to pass safely. 2. (verb, definition 2) Searching for something lost or valuable …

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