EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


Rock Run Conglomerate

July 08, 2021

Conglomerate

Photographer: Joshua Milden

Summary Author: Joshua Milden & Cadan Cummings

Found on the stream bed of Rock Run near Ralston, PA, this
sample of conglomerate consists of well-rounded quartz and
plagioclase feldspar clasts. Conglomerate is a sedimentary
rock composed of small rock granules (~ 0.08 in or 2 mm) cemented
together by a blend of calcium carbonate, iron oxide, and silica.
Typically, a mixture of sand, silt, and clay fills the airspace
between the rounded rocks. If the rock sample consists of angular,
broken granules fragments it is instead called a breccia. The
pictured conglomerate sample measures about 2 in (5 cm) thick and 5 in
(13 cm) long.

Rock Run is in the McIntyre Wild Area and features many beautiful
natural streams and waterfalls. The stream is a tributary to
Lycoming Creek and is fed by Baumunk Lake.

Photo data: LG Stylo 5 rear camera. ISO 50, automatic WB, focal length
3.159 mm, exposure time 1/40 sec
* Ralston, PA Coordinates: 41.507028, -76.953806

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More...

Geology Links

* Earthquakes
* Geologic Time
* Geomagnetism
* General Dictionary of Geology
* Mineral and Locality Database
* Mohs Scale of Mineral Hardness
* This Dynamic Earth
* USGS
* USGS Ask a Geologist
* USGS/NPS Geologic Glossary
* USGS Volcano Hazards Program

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Space Research Association.

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