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Ambrose Fault Vein (Horine vein), Jessamine Co., Kentucky, USA

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Latitude & Longitude (WGS84): 37° 49' 60'' North , 84° 30' 0'' West
Latitude & Longitude (decimal): 37.83333,-84.50000
Köppen climate type:Cfa : Humid subtropical climate

Commodities (Major) - Barium-Barite, Fluorine-Fluorite; (Minor) - Zinc
Development Status: Past Producer
Host Rock Unit: Lexington Limestone
Structure: Kentucky Anticlinal Fault Zone Intersects Vein, Horizontal Slickensides Due To Faulting
Host Rock: Limestone

Mineral List

4 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Middle Ordovician
458.4 - 470 Ma

ID: 3008059
Lexington Limestone

Age: Middle Ordovician (458.4 - 470 Ma)

Stratigraphic Name: Lexington Limestone

Comments: in west-central Kentucky, the thickness is 60-110 m; in north-central Kentucky the thickness is 15-60+ m; in northeastern Kentucky, the thickness is at least 45+ m; in east-central Kentucky, the thickness is 55-95 m; Middle Ordovician age

Lithology: Major:{limestone}, Minor:{shale}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Middle Ordovician
458.4 - 470 Ma

ID: 1948525
Lower part of Lexington Limestone

Age: Middle Ordovician (458.4 - 470 Ma)

Description: Limestone and minor shale: Limestone, medium- to yellowish-gray, weathers brownish to light brownish gray; composed mostly of brachiopod, bryozoan, trilobite, and mollusk remains and crinoid columnals; beds very irregular to even, in places cherty and dolomitic. Contains minor bioclastic limestone beds similar to those in the Tanglewood and a few thin units of interbedded micrograined limestone and shale. In northwest half of quadrangle two key horizons were mapped: The upper one (designated cr on map), about 105 feet above base of formation, is the top of a distinctive sequence of limestone containing abundant branching bryozoans, scattered straight-shelled cephalopods and high-spired gastropods, and articulated crinoid columnals about 1/4 inch in diameter; horizon is overlain by a dalmanellid brachiopod coquina. Lower key horizon (designated b on map), about 50 feet above base of formation is the top of a dalmanellid brachiopod coquina. \nLOGANA MEMBER USGS Unit Info: GEOLEX (id: 2522) Limestone and shale: Poorly exposed; micrograined limestone with locally common pelecypods, dalmanellid brachiopod coquina, and weathered shale are the only rock types observed. Present only in northwestern corner of quadrangle, grades laterally southeastward into the Grier Limestone Member. Dalmanellid brachiopod coquina (designated b on map and described above with the Grier) was used as the top of the Logana Member in the adjacent Nicholasville quadrangle (MacQuown, 1968). \nCURDSVILLE LIMESTONE MEMBER USGS Unit Info: GEOLEX (id: 1302) Limestone, light- to medium-gray, weathers light brownish to light olive gray, bioclastic (calcarenite), commonly cherty, crossbedded, contains a few beds of medium-gray micrograined limestone. Contact with underlying Tyrone Limestone is sharp with bioclastic limestone of the Curdsville Limestone Member resting on cryptograined limestone or metabentonite of the Tyrone; in places pebbles derived from the Tyrone are included in the lower part of the Curdsville. Fossils identified from collection YY include: Cyrtodonta sp., Vanuxemia gibbosa Ulrich, Bucania cf. B. halli Ulrich and Scofield, dalmanellids, Dinorthis pectinella (Conrad), and Hesperorthis tricenaria (Conrad).

Comments: Ollr; Little Hickman Quadrangle (GQ-792) | | Map description and column:

Lithology: Limestone | minor shale

Reference: KGS Databases, Maps, and Publications. Kentucky 1:24,000 Geologic Map. Kentucky Geological Survey. [22]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Rocks & Minerals 81:420-440

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