Hell's Half Acre Lava Field
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Hell's Half Acre lava field, is the youngest of the eastern basaltic lava fields of the Snake River Plain. Hell's Half Acre covers an area of about 400 sq km of Bingham County and Bonneville County it is south west of Idaho Falls. The field is the 2nd largest of the Snake River Plain fields. The lava is basaltic in nature which formed a broad, low shield volcano with dominantly pahoehoe flows that were erupted from a 3-km-long, NW-SE trending vent system at the NW part of the field during a brief eruptive episode about 5200 years ago. Interstate 15 highway crosses the south east edge of the lava field south west of the city of Idaho Falls. Hell's Half Acre lava field is a National Natural Landmark. 
[edit] References
http://www.volcano.si.edu/world/volcano.cfm?vnum=1204-04- http://imnh.isu.edu/digitalatlas/geo/greatrft/grztext/grzmain.htm http://www.id.blm.gov/recreation/hhacre/index.htm http://www.nps.gov/ccso/nnl/nnli.htm
