Assigned as lowermost member (formerly designated as Lincoln limestone) of Greenhorn limestone. Occurs in Russell Co, KS, Central Kansas uplift. Thin-bedded crystalline limestone at top commonly forms a minor bench on faces of steep slopes of Greenhorn limestone in the large valley, and at some places where slopes are gentler it makes a scarp. Consists of chalk, chalky shale, and thin beds of hard, dark-gray, crystalline, slightly sandy, fossiliferous limestone 2-6 in thick, and are massive within this thickness. Member is 20-25 ft thick. A few thin beds of yellow clay occur in lower half of member. Is brown to brown gray; where weathered is greenish or brownish gray. Overlain by Jetmore chalk member (new) of Greenhorn limestone; underlain by Graneros shale. Fossil list (GLOBIGERINA, fish bones and scales, INOCERAMUS, OSTREA). Columnar section. Of Late Cretaceous age.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Upper contact of Lincoln limestone member of Greenhorn limestone revised in report area, Ellis Co, KS, Central Kansas uplift. Greenhorn now divided into (ascending): Lincoln limestone member, Hartland shale member (new, this report; previously unnamed), Jetmore chalk member (contacts revised, this report), and Pfeifer shale member (new, this report; previously unnamed). Lincoln therefore underlies Hartland shale member of Greenhorn; overlies Graneros shale. Nearly 150 mi southwest of Ellis Co where the Greenhorn is exposed along the Arkansas valley in Kearny and Hamilton Cos, Anadarko basin, the four divisions of Greenhorn can be recognized, but upper two are less easily distinguishable. There the entire formation has a thickness of 130 ft; the upper 74 ft is made up of beds corresponding to Pfeifer shale and Jetmore chalk members--these beds are here named Bridge Creek limestone member of Greenhorn. Bridge Creek is immediately underlain by Hartland shale member, which is in turn underlain by Lincoln limestone member in this area. Is of Late Cretaceous age. Stratigraphic chart.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Lincoln Member, basal member of Greenhorn Formation extended areally to the Gold Creek exposure in sec 4, T31N, R17E, Colfax Co, NM in the Las Vegas-Raton basin. Is 61 ft thick in measured section. Consists of flaky, calcareous and noncalcareous shale. Top defined by 6-12-inch zone of limestone in beds 2 to 3 in thick. Beds at base are calcarenite and include a 1-ft-thick bentonite bed (probably the X bentonite bed). Overlies Graneros Shale. Underlies Hartland Member of Greenhorn. Of Cretaceous age.

Source: GNU records (USGS DDS-6; Denver GNULEX).

Is basal member of Greenhorn Limestone. Ammonite EUCALYCOCERAS TEMPLETONENSE from USGS Mesozoic localities D5848 and D10734, near Taylor Springs, Colfax Co, NM in Las Vegas-Raton basin indicates latest middle Cenomanian PLESIACANTHOCERAS WYOMINGENSE zone or earliest late Cenomanian DUNVEGANOCERAS PONDI zone. Presence of NEOCARDIOCERAS UPTONENSE from locality D12558, west of Pueblo, Pueblo Co, CO in Denver basin indicates early late Cenomanian D. PONDI or D. PROBLEMATICUM zone. [Term "limestone" considered redundant, and dropped from formal name.]

Source: GNU records (USGS DDS-6; Denver GNULEX).