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Valderan

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Journal Article
Journal: GSA Bulletin
Published: 01 July 1973
GSA Bulletin (1973) 84 (7): 2281–2298.
.... Frye and others (1968) defined the base of the Valderan Substage as the contact of the Valders till on the Two Creeks forest bed. Having concluded in this study that the Valders till does not overlie the forest bed (but correlates with the till which underlies it), the continued use of the term...
Journal Article
Journal: GSA Bulletin
Published: 01 August 1979
GSA Bulletin (1979) 90 (8): 781–791.
... and gray clays above. The red clays in Lake Michigan are found in areas overridden by glaciers of Valderan age as well as in the far southern end of the lake. Deposition of red clay took place in the northern part of the lake as the Valderan glaciers were melting and continued during the Algonquin stadial...
Journal Article
Journal: GSA Bulletin
Published: 01 April 1982
GSA Bulletin (1982) 93 (4): 289–296.
... been recognized, and this clearly overlies the Two Creeks Forest Bed. As previously reported, we conclude that the Valders Till is most likely of pre-Twocreekan age and that “Valderan” is an inappropriate term as a substage name for post-Twocreekan time and that the use of the term “Greatlakean...
Journal Article
Journal: Geology
Published: 01 October 1975
Geology (1975) 3 (10): 587–590.
...David M. Mickelson; Edward B. Evenson Abstract Red tills deposited by post-Twocreekan (Valderan) ice advances of the Green Bay and Lake Michigan Lobes in eastern Wisconsin do not extend to the type locality of the Valders till. The post-Twocreekan ice of the Lake Michigan Lobe terminated at the Two...
Journal Article
Journal: AAPG Bulletin
Published: 01 October 1969
AAPG Bulletin (1969) 53 (10): 2179–2186.
... defined as time-stratigraphic units. Frye presented definitions of the following substages within the proposed Wisconsinan Stage as used by the Illinois Geological Survey: Altonian, Farmdalian, Woodfordian, Twocreekan, and Valderan. These substages, it was generally agreed, had been named in accordance...
Journal Article
Published: 01 October 1998
Jour. Geol. Soc. India (1998) 52 (4): 457–462.
... ball). Cuad Geol. Univ. Granada, v.l, pp.79-89. ZAKRZEWSKA, B. (1970). Palaeogeographic implications of clay ball deposits under Valderan till in Wisconsin. Trans. Wi.scn, Acad. Sci. Arts Lett., v.S8, pp.153-162). (Received: 21 January 1997; Revisedform accepted: 22 April 1998) JOUR.GEOL.SOC.IND(A, VOL...
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1982
AAPG Bulletin (1982) 66 (2): 158–169.
... wedge and register seismically as high-amplitude reflectors. The uppermost onlapping sequence (WB-A) represents Woodfordian glacial, Twocreekan interglacial, Valderan glacial, and Holocene age sediments ( Beard, 1973 ). Woodfordian sediments onlap the Farmdalian surface, but, for the most part, were...
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