Point Reyes Conglomerate

Point Reyes Conglomerate (HM172C)

Location: Inverness, CA 94937 Marin County
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Country: United States of America
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N 37° 59.778', W 123° 1.2'

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Point Reyes National Seashore

The intriguing rock exposure in front of you is part of a formation that caps the highest hills in this area. The Point Reyes Conglomerate is a formation consisting of a sandy matrix embedded with pebbles, cobblestones, and boulders. Geologists estimate that the formation may be over 50 million years old.

Here you can see layers intersecting at different angles (cross bedding), and rounded cavities caused by the erosion of poorly cemented materials. Notice also that in any one layer the larger sand grains which sank first are at the bottom, while the finer ones lie on top (graded bedding)

Please do not chip or pick at the conglomerate.
Leave it intact for others to enjoy.
Details
HM NumberHM172C
Tags
Placed ByNational Park Service
Marker ConditionNo reports yet
Date Added Monday, September 15th, 2014 at 1:10pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10S E 498243 N 4205404
Decimal Degrees37.99630000, -123.02000000
Degrees and Decimal MinutesN 37° 59.778', W 123° 1.2'
Degrees, Minutes and Seconds37° 59' 46.68" N, 123° 1' 12.00" W
Driving DirectionsGoogle Maps
Area Code(s)415
Closest Postal AddressAt or near 27000 Sir Francis Drake Blvd, Inverness CA 94937, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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