Fort Rock

Fort Rock (HM257R)

Location: Fort Rock, OR 97735 Lake County
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Country: United States of America
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N 43° 21.33', W 121° 10.866'

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Oregon Geology and History

Fort Rock is the remnant of a maar volcano or tuff ring, formed when rising basaltic magma encountered water and exploded violently. The exploded debris - called tuff - fell back to earth around the volcanic vent to form this steep-walled, fort-like ring.
Over time, the basin filled with a shallow lake, which breached the south rim of the tuff ring and cut a terrace about 60 feet above the floor of the valley.
A State Monument and a National Natural Landmark, Fort Rock is one of several maars in the area; other examples are Hole-in-the-Ground, Table Rock, Flat Top, and Big Hole. Look ahead of you to the east for a view of Fort Rock in the distance.
Details
HM NumberHM257R
Series This marker is part of the series
Tags
, ,
Placed ByState of Oregon
Marker ConditionNo reports yet
Date Added Saturday, February 3rd, 2018 at 10:01am PST -08:00
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Locationbig map
UTM (WGS84 Datum)10T E 647399 N 4801900
Decimal Degrees43.35550000, -121.18110000
Degrees and Decimal MinutesN 43° 21.33', W 121° 10.866'
Degrees, Minutes and Seconds43° 21' 19.8" N, 121° 10' 51.96" W
Driving DirectionsGoogle Maps
Area Code(s)541
Which side of the road?Marker is on the right when traveling North
Closest Postal AddressAt or near 74543 OR-31, Fort Rock OR 97735, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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