Nally - Gibson Quarry, Springfield, Washington Co., Kentucky, USA
|Latitude & Longitude (WGS84):||37° 40' 20'' North , 85° 15' 29'' West|
|Latitude & Longitude (decimal):||37.67237,-85.25832|
Located south of town. A series of quarries (now closed but managed under Nalley & Hayden company) in the Upper Ordovician Bull Fork Formation. Minerals are common in fossils, particularly stromatoporoid sponges and brachiopods. Vugs up to 30 cm may be found, generally lined with scalenohedral calcite (white, pink or brown).
October 2013 - access road to the main pit is washed out.
11 valid minerals.
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 Macrostrat.org
443.8 - 458.4 Ma
Age: Late Ordovician (443.8 - 458.4 Ma)
Description: Dolomite, greenish-gray, fine-grained, calcareous; in obscure beds 1 to 10 inches thick, laminated in part; contains thin streaks of unidentified green mineral; weathers massive to platy. Upper part commonly crops out in gullies as smooth rounded ledge; lower part is less resistant, silty. Base gradational and poorly exposed. \nBARDSTOWN MEMBER USGS Unit Info: GEOLEX (id: 264) Limestone; dominant type is greenish gray, fine to medium grained, very silty (quartzose) and argillaceous, fossiliferous; in beds as much as 1 foot thick; weathers shaly. Limestone making up 5 to 25 percent is medium gray, micrograined to coarse grained, with abundant fossils and fossil fragments; in lenses and discontinuous beds commonly less than 3 inches thick. Minor interbeds of greenish-gray calcareous shale. Fossils very abundant throughout unit, include brachiopods, bryozoans, horn corals and colonial corals. Colonial coral heads occur mostly in several discontinuous layers; one layer commonly occurs near top, another is found in many areas 5 to 8 feet above base. Base placed at top of a widely exposed limestone bed of the Rowland Member; bed is gray, very fine grained to micrograined, and has a distinctive lumpy upper surface not found on other limestone beds of the Rowland Member. \nROWLAND MEMBER USGS Unit Info: GEOLEX (id: 3645) Limestone: Dominant type is greenish gray, fine grained, dolomitic, very silty (quartzose) and argillaceous, very sparsely fossiliferous; in faint, even beds 2 to 4 inches thick that are in part thinly laminated; sparse sun cracks and ripple marks; weathers shaly. About 20 percent is gray to greenish-gray, relatively pure, fine-grained to micro-grained limestone that commonly contains abundant ostracodes and sparse to common gastropods, brachiopods, and bryozoans; in even beds 1 to 30 inches thick that crop out as prominent rounded ledges; these fossiliferous beds more abundant in upper part of unit. In interval between about 5 and 10 feet above base of unit is a rarely exposed zone of abundant brachiopods and bryozoans that is similar to nodular limestone in the upper member of the Grant Lake Limestone. Base placed at top of widely exposed calcarenite zone of underlying unit.
Comments: Od; Saint Catharine Quadrangle (GQ-1252) | http://kgs.uky.edu/kgsweb/PubsSearching/MoreInfo.asp?titleInput=353 | Map description and column: http://kgs.uky.edu/kgsmap/kgsgeoserver/geolDescID.asp?idType=pointID&fmcode=361DRKS&gq_num=1252&map_level=24K
Reference: KGS Databases, Maps, and Publications. Kentucky 1:24,000 Geologic Map. Kentucky Geological Survey. 
443.8 - 485.4 Ma
Age: Ordovician (443.8 - 485.4 Ma)
Stratigraphic Name: Drakes Formation
Comments: in west-central Kentucky, thickness is 0-55 m.
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.