U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Rulo
Search archives
Map showing publication footprint
  • Usage in publication:
    • Rulo limestone member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Forest City basin
Publication:

Condra, G.E., and Bengtson, N.A., 1915, The Pennsylvanian formations of southeastern Nebraska: Nebraska Academy of Sciences Publications, v. 9, no. 2, 60 p., See also "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 1


Summary:

Pg. 8, 14, 26. Rulo limestone, basal member of Nemaha formation. Light-colored hard massive limestone, 12 to 20 inches thick, lying 8 to 12 feet below Burlingame limestone and overlying City Bluffs (Scranton) shales. Age is Pennsylvanian. Report includes measured sections, cross sections.
Type locality: 2.5 mi north of Rulo, Richardson Co., southeastern NE.

Source: US geologic names lexicon (USGS Bull. 896, p. 1559); GNC KS-NE Pennsylvanian Corr. Chart, sheet 1, Oct. 1936; supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Rulo limestone bed
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Forest City basin
Publication:

Condra, G.E., 1927, The stratigraphy of the Pennsylvanian system in Nebraska: Nebraska Geological Survey Bulletin, 2nd series, no. 1, 291 p., See also "Modern classifications of the Pennsylvanian rocks of eastern Kansas and southeastern Nebraska," compiled by M.G. Wilmarth, Secretary of Committee on Geologic Names, USGS unpub. corr. chart, Oct. 1936, sheet 1


Summary:

Pg. 40, 41, 58, 105, 106. Rulo limestone bed of Scranton shale member of Shawnee formation. Included in Scranton shale his Rulo limestone and the shale (named Silver Lake shale) separating it from overlying Burlingame limestone; and this classification was adopted by R.C. Moore and G.E. Condra in their Oct. 1932 revised classification chart of Pennsylvanian rocks of Nebraska and Kansas. Condra's 1927 publication stated that Elmo-Silver Lake coal is just below Rulo limestone. Age is Late Pennsylvanian (Missouri age). Report includes cross sections, measured sections, geologic maps, stratigraphic tables.

Source: US geologic names lexicon (USGS Bull. 896, p. 1855); GNC KS-NE Pennsylvanian Corr. Chart, sheet 1, Oct. 1936; supplemental information from GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Rulo limestone member*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Forest City basin
Publication:

Moore, R.C., and Mudge, M.R., 1956, Reclassification of some Lower Permian and Upper Pennsylvanian strata in northern Midcontinent, IN Geological notes: American Association of Petroleum Geologists Bulletin, v. 40, no. 9, p. 2271-2278. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Pg. 2274 (fig. 1), 2277. Rulo limestone member of Scranton shale. Rank reduced to member status in Scranton shale, here reintroduced as a formation with stratigraphic span as assigned to it by Haworth and Bennett (1908). Underlies Silver Lake shale member; overlies Cedar Vale shale member. Age is Late Pennsylvanian (Virgilian).

Source: US geologic names lexicon (USGS Bull. 1200, p. 3357).


Search archives

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).