Lecture 10 - Additional field trip & announcements (Oct 4)

Lecture 10 - Additional field trip & announcements (Oct 4)

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Unformatted text preview: !""#$"%&'&"()*+ !""#$%&'()*+&& ,(-.&/%0.&1*#&"*(2&33456738456&#-&9:;&83<& ,:=1+& &2)+>&$(->?$>&@#+?&@%(-#&A#>'#-&3& A%%B&(*&,:=1&$(-+#0%*%0&C(#0& =>>%-0?-$%&?>&D')*+0?EF+&$G?++&#+&2?-0?>(*E& HI)%+>&G%$>)*%J& &-%%0&#-"(*2?>#(-&"*(2&>'#+& G%$>)*%&"(*&>'%&)K$(2#-I&9L:&M)#N& O(&$G?++&(-&1*#0?E.&P)>&1*#0?EF+&G?P+&?*%&+>#GG& *)--#-IQ& R?KKE&D'?-B+I#C#-IQ& & Geology of the Hamilton region A%&+?A&>'%+%&)-#>+&#-&"#%G0& Rock layers in the Niagara Escarpment &#-&@?P&,?-)?G&pg.34 How did these rocks form? ,-.'+(.#/0%-1+#%&-")+ @#2%+>(-%+&?-0&0(G(+>(-%+& "(*2&#-&+'?GG(A.&$G%?*&A?>%*& 7-(&+%0#2%->&#-K)>& Mudstones and shales form in quiet water Sandstones indicate higher energy conditions beaches or storms Sediments deposited on sea floor - then lithified (made into rock) Where did the sediment come from? Large deltas formed by rivers draining the Taconic mountains - shales and sandstones How did the Taconic mountains produced the form? collisonal plate margin at that time m ountains Formation of the Niagara Escarpment Escarpment rocks are old 400-500 million yrs Escarpment as a landform is young! Formed by glacial and fluvial erosion e.g. Niagara Falls today Formation of Niagara Falls+ S10 km erosion over 12,500 years Niagara Escarpment Lockport Dolostone More easily eroded rocks below - Rochester Shale Undercutting causes retreat of the falls/ escarpment This is what happened at Niagara Falls, also on a smaller scale at Tiffany Falls Similar processes have produced waterfalls and valleys in Hamilton area e.g. Tiffany Falls ...
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This note was uploaded on 11/28/2011 for the course ENV SCI 1G03 taught by Professor Padden during the Fall '11 term at McMaster University.

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