River of Rocks - The Devils Homestead Lava Flow

River of Rocks - The Devils Homestead Lava Flow (HM16Z6)

Location: Tulelake, CA 96134 Siskiyou County
Country: United States of America

N 41° 47.586', W 121° 33.72'

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At some time within the last several thousand years, an eruption of magna from the bottom of the earth crust sent a broad stream of hot liquid rock across this land. The flow started to your right, 3.2 kilometers (2 miles) south of here at the site of a spatter cone formation known as a Field of Chimneys. When the eruption stopped, the lava cooled and hardened into its present form, but how did it look like a river of rocks?

Pahoehoe lava began flowing downhill toward Tule Lake to your left. It was very hot (1200?C), but cooling and loss of gas began right away. As the flow crept along the outer several inches solidified into a hard layer. Under stress from the still liquid and very mobile flow interior, the lava crust broke repeatedly, forming a jumble of frothy-looking plates that were rafted along like blocks of ice on a river.

By the time the flow reached here, cooling and loss of gas had transformed it into a rough cinder-like lava called aa.

Pahoehoe lava (pah-HOY-hoy) — a hot, gas rich, low viscosity basalt.
Aa lava (AH-ah) — a cooler, less gaseous, higher viscosity basalt.
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HM NumberHM16Z6
Placed ByNational Park Service
Marker ConditionNo reports yet
Date Added Monday, September 29th, 2014 at 12:17am PDT -07:00
Locationbig map
UTM (WGS84 Datum)10T E 619478 N 4627804
Decimal Degrees41.79310000, -121.56200000
Degrees and Decimal MinutesN 41° 47.586', W 121° 33.72'
Degrees, Minutes and Seconds41° 47' 35.16" N, 121° 33' 43.20" W
Driving DirectionsGoogle Maps
Area Code(s)530
Closest Postal AddressAt or near 110 Hill Rd, Tulelake CA 96134, US
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