Volcanic Ash

Volcanic Ash (HM2CME)

Location: Morrison, CO 80465 Jefferson County
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Country: United States of America
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N 39° 40.661', W 105° 11.658'

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Inscription
A volcano erupted hundreds of miles from here and ash from the volcano
blanketed this area, which was a swampy environment. Subsequent burial,
compaction, and chemical alteration led to this four inch white to rusty orange
colored claystone layer (tonstein), which was derived from the volcanic ash.
In 2009, the Massachusetts Institute of Technology (MIT) extracted zircon
crystals [ZrSiO4] from this layer to date it. These crystals formed in the magma
chamber of the volcano. MIT was able to measure the amount of lead and uranium
in the zircon crystals. Since unstable uranium (U) decays to lead (Pb) at a known
rate, MIT was able to assign an absolute age of 104.6 million years +/- 40,000
years to this ash layer.
Details
HM NumberHM2CME
Tags
Marker ConditionNo reports yet
Date Added Tuesday, October 23rd, 2018 at 8:04pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)13S E 483336 N 4392002
Decimal Degrees39.67768333, -105.19430000
Degrees and Decimal MinutesN 39° 40.661', W 105° 11.658'
Degrees, Minutes and Seconds39° 40' 39.66" N, 105° 11' 39.48" W
Driving DirectionsGoogle Maps
Area Code(s)303, 720
Closest Postal AddressAt or near W Alameda Pkwy, Morrison CO 80465, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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