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Dry Creek
Basic information Name: Dry Creek
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2018
Country: United States
Mass:help 5 kg
Meteoritical Bulletin:  MB 108  (2020)  H5
Recommended:  H5    [explanation]

This is 1 of 11567 approved meteorites (plus 23 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 16 Feb 2019
Writeup from MB 108:

Dry Creek        44°02.523’N, 101°55.491’W

South Dakota, United States

Find: Aug 2018

Classification: Ordinary chondrite (H5)

History: In August 2018, Lloyd Griswold found a single 5 kg stone in a hay field on his property in Haakon County, South Dakota, approximately 8.5 km north of Cottonwood.

Physical characteristics: Exterior of type specimen has weathered brown-black fusion crust, with glossy patches. A broken surface is covered with whitish caliche. Two cut faces are visible: the surfaces of both are reddish brown. Only the larger cut face has remnant patches of metal visible. A thin section was created from one of these metal-containing remnant patches.

Petrography: (M. Hutson, A. Ruzicka, Cascadia) In thin section approximately 70% of the opaque minerals have been replaced by iron hydroxide weathering products. This material is opaque in transmitted light and both surrounds and crosscuts chondrules, chondrule fragments, and individual mineral grains. Plagioclase feldspar grains observed in BSE images are typically 20-25 μm across, with two grains up to 50 μm across.

Geochemistry: Mineral compositions and geochemistry: Olivine (Fa19.5±0.2, N=14), low-Ca pyroxene (Fs17.4±0.2Wo1.5±0.2, N=12).

Classification: H5 based on iron contents in olivine and pyroxene and size of plagioclase feldspar grains.

Specimens: Cascadia holds 179.4 g in six pieces, in addition to a polished thin section and a mounted butt.

Data from:
  Table 0
  Line 0:
State/Prov/County:South Dakota
Origin or pseudonym:Hay field
Date:Aug 2018
Mass (g):5000
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):19.5±0.2
Ferrosilite (mol%):17.4±0.2
Wollastonite (mol%):1.5±0.2
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):179.4
Type spec location:Cascadia
Main mass:Lloyd Griswold
Finder:Lloyd Griswold
Comments:Lab number CML 1118; may be paired with Faith (H5) which was found roughly 87 miles to the north and/or Lemmon (H5) which was found roughly 130 miles to the north.; submitted by Alex Ruzicka
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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United States
     Recommended::   (44° 2' 31"N, 101° 55' 29"W)

     This is 1 of 19 approved meteorites from South Dakota, United States
     This is 1 of 1927 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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