 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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Geology Links

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     *  Geologic Time
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     *  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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