Beach walk geology trip at Marrowstone Island, Jefferson County.

A field trip written by Dan McShane is now posted. Originally appearing on Dan’s Reading the Washington Landscapes blog, I got his permission to post it on Northwest Geology Field Trips, and you’ll find it here. This looks like a fine low tide beach walk, south of Port Townsend. A unique feature on the trip is an Eocene dike of basalt that intrudes marine sandstone. That alone is worth the trip, but there is a lot more to see. Plus, Dan tells me, solitude is to be expected.

The dark rock at left is a basalt dike, in contact with lighter sandstone at right.

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2 Responses

  1. What is marrow stone (deposits)? See nothing in geologic terms to describe what George Vancouver supposedly was referring to when he named Marrow Stone Point.

    • Steve,
      I don’t know the origin of the name. It is not a geologic term. Perhaps Vancouver named the place after a supporter/patron back in Merry Olde?
      Dave Tucker

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