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File:Gooseberry Falls - Main Falls (Middle Falls) (Gooseberry River, North Shore of Lake Superior, Minnesota, USA) 8 (22317705338).jpg

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(8 June 2015)

The iced tea color of the water is due to the presence of tannins (= organic compounds derived from plants).

The rocks are olivine tholeiite basalts (some are amygdaloidal) of the ~1.1 billion year old North Shore Volcanic Series. These basalts are flood lavas that filled up an ancient rift valley (= Lake Superior segment of the Mid-Continent Rift System), representing a tear in the ancient North American paleocontinent of Laurentia.

Stratigraphy of rocks: Gooseberry River Basalts, Upper Southwest Sequence, North Shore Volcanic Group, upper Mesoproterozoic, 1097-1098 Ma

Locality: Gooseberry Falls - Main Falls (Middle Falls), Gooseberry River, a little inland from the North Shore of Lake Superior, northeastern Minnesota, USA
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Source Gooseberry Falls - Main Falls (Middle Falls) (Gooseberry River, North Shore of Lake Superior, Minnesota, USA) 8
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/22317705338. It was reviewed on 28 January 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

28 January 2020

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current02:13, 28 January 2020Thumbnail for version as of 02:13, 28 January 20204,000 × 3,000 (3.96 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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