...CLINTON R. STAUFFER; GEORGE M. SCHWARTZ; GEORGE A. THIEL Abstract Pioneer work on the St. Croixian series of Minnesota and Wisconsin was done by Owen. In Minnesota this was followed by the work of N. H. Winchell and his associates. The classification thus established has been used with but slight...

... MINNESOTA *  Upper Cambrian    St. Croixian series      Jordan formation        Van Oser member        Norwalk member      St. Lawrence formation        Lodi member        Nicollet Creek member      Franconia formation        Bad Axe member        Hudson member...

... of the Cambro-Ordovician rocks under which this ancient land surface is preserved, leads to the conclusion that these six quartzite hills are residual monadnocks rising above a peneplain eroded in pre-St. Croixian time across a complex terrane of pre-Cambrian igneous and metamorphic rocks. Control...

...) near the middle of the Upper Cambrian Croixian Series (Millardan Series of current usage for Laurentia). The Au Train Formation overlies the Munising Formation and reaches a thickness of about 90 m (295 ft.) in the subsurface ( Hamblin, 1958 ). The Au Train in the measured section comprises...

... geologists correlate its sediments with the upper Cambrian (Croixian); and existence between Permian and Triassic of a time interval equal in magnitude to a period, as suggested by Grabau. If there was a “Geological Sunday,” it seems that it was a time when only little and rather localized sedimentation took...

... of Little Falls. The Croixian age assignment of the Little Falls is based solely on faunal evidence in adjacent units and in lateral equivalents. Because there is no one complete section available at Little Falls, the general environs of that city are considered to represent the type locality, within...

... features of the Mid-Continent area such as the Forest City basin, Nemaha Ridge, Central Kansas uplift, Las Animas arch, Anadarko basin, Marietta basin, Ozark uplift, and many others ( Fig. 1 ). Late Cambrian, Croixian seas advanced across the Mid-Continent area as a result of eustatic rise...

...; Caut, Cautleyan; Rawth, Rawtheyan; Hirnan., Hirnantian; Croix., Croixian; Tremp., Trempealeauan; Black., Blackhillsian; Rang., Rangerian; Maysvill., Maysvillian; Richmond., Richmondian; Gamach., Gamachian. %CT, data from Cassiar Terrane; N. Am., North American. ...

... (1.0–1.3 Ga), a few Wolf River batholith (1.45 Ga), Penokean (1.85 Ga), and Archean (2.6–3.6 Ga) ages. The youngest zircon age is 1088 Ma. The middle Cambrian Mt. Simon (St. Croixian series, Dresbachian stage, late Cambrian; Webers 1972 ) is exposed around central and western Wisconsin, and we...

... of Asteriacites , Ordovician of Czechoslovakia : Ichnos , 1 . 133 – 137 . Nelson , C. A. , 1951 , Cambrian Trilobites from the St. Croix Valley : Journal of Paleontology , 25 . 765 – 784 . Nelson , C. A. , 1956 , Upper Croixian stratigraphy, upper Mississippi valley : Bulletin...

... to Atlantic Realm Zonation after Löfgren and Zhang ( 2003 , and references therein). N. AM., North American; Croix., Croixian; Fm., Formation. ...

... geologists as the Oklahoma basin or Arbuckle geosyncline, had its inception with downwarping of the basement complex to form a narrow, linear depositional belt in Late Cambrian time. After deposition of the Reagan Sandstone (Croixian) and approximately 7,000 feet of Arbuckle carbonates (Cambro-Ordovician...

... eastern Montana confirming that the Deadwood is of Late Cambrian through Early Ordovician age where the thicker sections are preserved. A regional disconformity separates Winnipeg and Deadwood rocks. Phanerozoic sedimentation was initiated in the Williston basin during latest Cambrian (Croixian...

... of Croixian dikelocephalids : Illinois Academy of Science Transactions , 44 . 137 – 151 . Rolfe , W. D. I. , 1981 , Phyllocarida and the origin of the Malacostraca : Géobios , 14 . 17 – 27 . Rose , E. C. , and Hagadorn , J. W. , 2006 , Why the Sauk Transgression is not just...

... , 2002 , 2003 ). No horizontal scale is intended for facies transitions. N. Am., North American; Croix., Croixian. ...

... of the Proterozoic basement is approximately 245 m higher beneath the crest of the fold than it is 13 km away from the crest. Basal Cambrian strata (Croixian Mount Simon Sandstone) are absent from the crest ( Nelson, 1995a ). These relations strongly suggest Neoproterozoic to Cambrian faulting. It was inferred...