• Login
    View Item 
    •   Repository Home
    • Brock Theses
    • Masters Theses
    • M.Sc. Earth Sciences
    • View Item
    •   Repository Home
    • Brock Theses
    • Masters Theses
    • M.Sc. Earth Sciences
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Drift dispersal in central Southern Ontario /

    Thumbnail
    View/Open
    Brock_Podolak_Wilfred_1984.pdf (6.952Mb)
    Podolak fig 2.pdf (1.454Mb)
    Podolak fig 3.pdf (1.791Mb)
    Podolak fig 20.pdf (1.413Mb)
    Podolak fig 21.pdf (1.531Mb)
    Podolak fig 22.pdf (1.201Mb)
    Date
    1984-06-01
    Author
    Podolak, Wilfred E.
    Metadata
    Show full item record
    Abstract
    Two tills are readily identi-f i able in central Southern Ontario, a very stony, loose deposit o-f variable matrix (Dummer till) and a moderately stony, fissile and compact deposit that is more homogeneous (drumlinized till). The quantity o-f Precambr i an, Paleozoic and Shadow Lake Formation (Paleozoic) rock types were determined and corresponding isopleth maps drawn. The changes in lithology content occurred in the direction o-f transport, there-fore, compositional isopleths o-f till may be considered equipotential lines for the reconstruction of glacier flow paths. Areal gradations of drift lithology indicated that the prime agents of dispersal were ice and glacial meltwaters. The down-ice abundance trend of till components indicated a dispersal pattern showing the concentration of a given lithology type peaking within a few kilometres of the source followed by a rapid decline and thereafter, a more gradual decrease with increasing distance. Within the esker deposits, igneous rocks may form the major component and can extend further onto the limestone plain than in the adjacent till. Evidence is presented that indicates the "style" of dispersal was one in which glacial ice may have been strongly influenced by local bedrock topography and the regional structural trends. The ice tended to follow pre-existing valleys and lows, depositing till composed mainly of local bedrock. Gradations in Paleozoic clast content showed that the local bedrock lithology became the primary till component within 3 km of down-ice transport. Evidence is presented that indicated the last glaciation may have occurred as a relatively thin ice mass, followed by stagnation and recession. No evidence of a lateglacial re-advance was found within the study area. Because of the lack of a contact between the Dummer and drumlinized till, and because of results showing gradation of the Dummer till into the drumlinized till (as indicated by lithology content and grain size), it is suggested that no re-advance occurred.
    URI
    http://hdl.handle.net/10464/1499
    Collections
    • M.Sc. Earth Sciences

    Brock University | Copyright © 2006-2015 
    Contact Us | Send Feedback
     

     

    Browse

    All of DSpaceCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister

    Statistics

    View Usage Statistics

    Brock University | Copyright © 2006-2015 
    Contact Us | Send Feedback