1-17 OF 17 RESULTS FOR

Mineralization of the Platteville-Decorah contact zone

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Journal: GSA Bulletin
Published: 30 December 1925
GSA Bulletin (1925) 36 (4): 615–622.
... variation in the chemical changes that have taken place since the deposition of the sediments. Recently rather extensive excavations and tunnelings have been made in the Minneapolis and Saint Paul area, which show especially the basal Decorah shale, all of the Platteville limestone, and the upper part...
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1955
AAPG Bulletin (1955) 39 (9): 1703–1752.
... known Spechts Ferry, but are like zones that occur lower in the Platteville, adjacent to the St. Peter sandstone. Another reason for not considering these beds as Decorah is that the characteristic phosphatic pebble zone of the Spechts Ferry is not present in this part of the state. In northwestern...
FIGURES | View All (13)
Journal Article
Journal: AAPG Bulletin
Published: 01 November 1990
AAPG Bulletin (1990) 74 (11): 1736–1747.
..., Platteville Group; D, Deicke K-bentonite; C, Carimona Member of the Spechts Ferry Formation; M, Millbrig K-bentonite; KL, Kings Lake Formation; K, Kimmswick Subgroup of the Galena Group. A resistivity log from a well situated 35 km southeast of Bloomsdale ( Figure 1 , loc. 1) shows the shaly Decorah...
FIGURES | View All (8)
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1951
AAPG Bulletin (1951) 35 (9): 2041–2075.
... the Decorah formations. These beds, formerly the Plattin limestone, have generally been classified as Bolarian, of Black River age, and correlated with the Platteville limestone of the upper Mississippi valley. Little work has been done on the Plattin since its definition by Ulrich (1904, p. 111...
FIGURES | View All (16)
Journal Article
Journal: AAPG Bulletin
Published: 01 December 1934
AAPG Bulletin (1934) 18 (12): 1597–1631.
...., Monticulipora sp., Rafinesquina sp., Rhynchotrema sp., Plectambonites sp., Zygospira recurvirostris . Decorah shale .—This formation includes all shale and calcareous beds between the Platteville and Galena formations. It has been recognized in the Lane, Jeep, Schuyler, Amerada (Nehawka) wells...
FIGURES | View All (9)
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(12)
EISBN: 9780813756240
.... Fitchburg West Road Cut, St. Peter Sandstone– Platteville Formation Contact Figure 7. Localities of field trip stops. Numbers refer to stop numbers in the field guide. Figure 8. Cross section based on quarry and core data showing topography at the base of the St. Peter Sandstone (Ss...
FIGURES | View All (20)
Journal Article
Journal: GSA Bulletin
Published: 01 August 2001
GSA Bulletin (2001) 113 (8): 1067–1078.
... ). In Missouri, Iowa, and Minnesota, the DS2 surface is downlapped by shales and interbeds of skeletal packstone of the Spechts Ferry Shale Member of the Decorah Formation. The DS3 contact between the Spechts Ferry Shale and the overlying Guttenberg Limestone Member and its position in the more cratonward...
FIGURES | View All (9)
Journal Article
Published: 01 January 2021
Journal of Paleontology (2021) 95 (1): 106–122.
... plattevillensis n. gen. n. sp. from the Upper Ordovician Platteville Formation (Sandbian) of northern Illinois, USA. Morphological features include a large, low-trochiform shell, a narrow lenticular aperture, a deep funnel-like umbilicus, a falcate inner lip and a large (1.4 mm wide) protoconch. Ornamentation...
FIGURES | View All (8)
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1927
AAPG Bulletin (1927) 11 (9): 967–975.
... samples. The Bromide formation, as correlated by Ulrich, is said to be Blount or upper Chazy in age. Dake states 1 that the fauna collected from the first three hundred feet of sediments underlying the Viola lime shows a “dominance of Black River species, particularly of the Platteville and Decorah...
FIGURES
Journal Article
Journal: AAPG Bulletin
Published: 01 July 1947
AAPG Bulletin (1947) 31 (7): 1242–1282.
... of the zone 5 limestone, though it is recognized that correlations with Iowa and Missouri strata may eventually indicate a Decorah or Platteville age for these somewhat shaly layers. LOG OF STANOLIND OIL AND GAS COMPANY’S MARTIN NO. 1, SEC. 3, T. 16 S., R. 3 W. Depth (Feet) Descriptions...
FIGURES | View All (30)
Journal Article
Journal: GSA Bulletin
Published: 01 January 2004
GSA Bulletin (2004) 116 (1-2): 200–218.
... of the Wisconsin Arch. The key Paleozoic units exposed in the vicinity of the Rock Elm structure are of Early to Middle Ordovician age. From oldest to youngest, they are the Prairie du Chien Group, St. Peter Sandstone, Glenwood Formation, Platteville Formation, and Decorah Formation. The Early Ordovician...
FIGURES | View All (5)
Journal Article
Journal: AAPG Bulletin
Published: 01 June 1936
AAPG Bulletin (1936) 20 (6): 677–703.
..., Pennsylvanian, Cretaceous, and Tertiary. An unconformity that is seemingly best explained as due to submarine development is that said to be present in the upper Mississippi Valley in the lead and zinc district between the Ordovician Decorah formation and the overlying Galena. The contact is characterized...
Journal Article
Journal: AAPG Bulletin
Published: 01 January 1952
AAPG Bulletin (1952) 36 (1): 1–72.
... and varieties of graptolites and indicates that they came from a lower and an upper zone ( Ruedemann, 1947 , p. 72). Woodward .—Two years later Herbert P. Woodward (1932 , pp. 47–51) completed his paper on the geology and mineral resources of the Roanoke area, Virginia, accompanied by a geologic map...
FIGURES | View All (49)
Journal Article
Journal: AAPG Bulletin
Published: 01 September 1941
AAPG Bulletin (1941) 25 (9): 1619–1705.
... wells drilled in the general vicinity of Gotebo. Exact correlations of these formations with subdivisions in the Ozark areas have not been established, although the Bromide contains a Black River fauna, and is equivalent to the Plattin of Missouri and Platteville and possibly Decorah of the upper...
FIGURES | View All (16)
Journal Article
Published: 16 May 2018
Canadian Journal of Earth Sciences (2018) 55 (9): 1036–1062.
...: marine calcite cement (boxes; Tobin et al. 1996 , 2005 ); and, brachiopod calcite (from Ludvigson et al. 1996 ) for, in stratigraphic order, the upper Turinian Platteville Formation ( a ); the lower Chatfieldian Decorah Formation: the Sprechts Ferry Member ( b ); and the Guttenberg Member ( c...
FIGURES | View All (15)
Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(11)
EISBN: 9780813756240
.... With our water resources, society is gambling far more than we can afford to lose. We are learning the real rules of the game. This field trip focuses on the karst hydrogeology of the Ordovician Galena and the Prairie du Chien Groups and on the Decorah Shale, Platteville Limestone, and the St. Peter...
FIGURES | View All (7)
Journal Article
Published: 01 May 2011
Journal of Paleontology (2011) 85 (3): 406–441.
... University, 236 p. Demott L. L. 1987 Platteville and Decorah trilobites from Illinois and Wisconsin Minnesota Geological Survey Report of Investigations 35 63 98...
FIGURES | View All (15)