- Usage in publication:
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- Juniper Flat stock
- Modifications:
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- First used
- AAPG geologic province:
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- Pedregosa basin
Summary:
Mentioned as being intrusive into Paleozoic rocks and overlain by the basal conglomerate of the Cretaceous in the Bisbee district in the Pedregosa basin. (Not a formal proposal of name). Is early Mesozoic in age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Juniper Flat granite
- Modifications:
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- Age modified
- AAPG geologic province:
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- Pedregosa basin
Summary:
Intrudes Precambrian schist and is overlain by basal conglomerate of the Cretaceous (northwest of Bisbee in the Pedregosa basin), but its relation to the Paleozoic is not clear (not a formal proposal of name).
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Juniper Flat granite*
- Modifications:
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- Named
- Dominant lithology:
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- Granite
- AAPG geologic province:
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- Pedregosa basin
Summary:
Pg. 53-55, pl. 5. Juniper Flat granite. Light-reddish-brown in outcrop and pinkish-gray on fresh fracture. Most it is porphyritic within central Cochise County, southeastern Arizona, although much of it along Tombstone Canyon is equigranular. Considerable range in grain size. Forms discordant intrusive masses that cut all formations up to and including Horquilla limestone. Rough tendency to form sills beneath Bolsa quartzite; all other contacts appear to be clean cut and without regard to preexisting structures. Older than Glance formation. Age is Triassic or Jurassic. Type locality designated. Report includes geologic map.
Type locality: Juniper Flat on west side of Mule Mountains, where granite is well exposed. Also well exposed on northeast wall of Tombstone Canyon. In Bisbee quadrangle, west-central Cochise Co., southeastern AZ.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1952-1953).
- Usage in publication:
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- Juniper Flat Granite*
- Modifications:
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- Age modified
- Geochronologic dating
- AAPG geologic province:
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- Pedregosa basin
Summary:
Dated as 163 Ma by K-Ar method and 176 and 178 Ma by Rb-Sr method and therefore presumed to be of Early Jurassic age. Is in Pedregosa basin.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Juniper Flat Granite*
- Modifications:
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- Age modified
- AAPG geologic province:
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- Pedregosa basin
Summary:
Is intrusive into late Paleozoic rocks and is unconformably overlain by Bisbee Group (Early Cretaceous); thus it is probably Triassic or Jurassic in age on basis of stratigraphic position dating.
Source: GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Juniper Flat Granite*
- Modifications:
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- Geochronologic dating
- AAPG geologic province:
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- Pedregosa basin
Summary:
Samples collected from Juniper Flat Granite in AZ, Lat. 31 deg. 30 min. 10 sec. N., Long. 110 deg. 00 min. 39 sec. W. Recalculated Rb-Sr ages on biotite are 186 Ma and 188 Ma.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).
- Usage in publication:
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- Juniper Flat Granite*
- Modifications:
-
- Geochronologic dating
- AAPG geologic province:
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- Pedregosa basin
Summary:
Samples collected from Juniper Flat Granite in the Mule Mountains, Cochise Co., AZ. Recalculated K-Ar age is 171 +/-7 Ma; recalculated Rb-Sr age is 182 +/-7 Ma.
Source: Modified from GNU records (USGS DDS-6; Denver GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).