File:Basalt agglomerate (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 1.jpg

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English: Basalt agglomerate in the Eocene of Oregon, USA.

"Agglomerate" refers to coarse-grained, poorly-sorted deposits of volcanic clasts. The example seen here is a basalt agglomerate along coastal Oregon. The rocks were erupted from a Late Eocene-aged volcano, resulting in a volcanic succession called the Yachats Basalt. The sequence is mostly basalt lava flows, but includes some andesite and trachyandesite. Igneous dikes are also present - most are basalt, plus minor andesite and rhyodacite.

Basaltic flows in the Yachats Basalt are often porphyritic, with labradorite plagioclase feldspar phenocrysts. Glomeroporphyritic varieties are present, with clusters of blade-shaped plagioclase phenocrysts.

The stream in the bottom foreground is Cape Creek.

Stratigraphy: Yachats Basalt, Upper Eocene, ~36-37 Ma

Locality: outcrop at the southern edge of a sandy-gravelly beach at Heceta Head, coastal Oregon, USA (vicinity of 44° 08' 02.18" North latitude, 124° 07' 24.58" West longitude)

Some info. from:

Snavely & MacLeod (1974) - Yachats Basalt - an Upper Eocene differentiated volcanic sequence in the Oregon Coast Range. Journal of Research of the United States Geological Survey 2: 395-403.
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Source https://www.flickr.com/photos/47445767@N05/53254180106/
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@N05/53254180106. It was reviewed on 16 October 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

16 October 2023

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