Title

Bedrock 24k New Harbor Photo 4

Creator

David P. West Jr.

Preview

Contributing Institution

Maine Geological Survey

Document Type

Image

Identifier

72130

Description

Photo 4: A view toward the north of a tabular dike of very light gray intrusive igneous rock (granite) cutting across medium gray, strongly foliated, porphyritic granodiorite of the South Pond Porphyry (Dsp) that contains an elongated mass of dark gray metamorphic rock (possibly a xenolith). A generalized history of this outcrop can be summarized as follows: (1) Igneous crystallization, ~415 million years ago, of a porphyritic granodiorite magma deep underground that contained a darker colored mass (possible xenolith). (2) Deformation of these rocks in the solid state due to superimposed stress, which imparted a strong north-south alignment of the minerals within the granodiorite and the possible xenolith. (3) Later, flow of hot silica-rich fluid magma up through a crack in the rocks and then solidification in place as granite. (4) Uplift and erosion over millions of years, of miles of overlying rocks, exposing formerly deep rocks at the surface. South end of Eastern Egg Rock, Saint George.
Project Name: STATEMAP New Harbor Bedrock24k

Exact Creation Date

9-16-2022

Location

Saint George

Supplemental Rights

Credit must be given to the photographer and the Maine Geological Survey when this photo is displayed, reproduced, distributed and/or used in derivative works.