Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA
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|Location is approximate, estimate based on other nearby localities.|
|Latitude & Longitude (WGS84):||34° North , 92° West (est.)|
|Margin of Error:||~3km|
|Köppen climate type:||Cfa : Humid subtropical climate|
A complex intrusion (pluton) of medium- to coarse-grained syenite (nepheline & somewhat porphyritic alkali syenite), that crops out in a belt. The outcrop runs from Benton, Saline Co. to the city limits of Little Rock, Pulaski Co. The older unit is an altered olivine syenite and the younger an analcime nepheline syenite.
Mineral ListMineral list contains entries from the region specified including sub-localities
93 valid minerals. 2 (TL) - type locality of valid minerals.
GeochronologyMineralization age: Late Cretaceous : 94 ± 5 Ma to 89 ± 4 Ma
Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.
|Geologic Time||Rocks, Minerals and Events|
Localities in this Region
- Pulaski Co.
- Little Rock
- Pulaski Co.
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Rocks & Min.: 63:120-121; 64:314; Barwood (1987);