402-pp15 - UNIVERSITY OF SOUTH ALABAMA GY 402: Sedimentary...

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Unformatted text preview: UNIVERSITY OF SOUTH ALABAMA GY 402: Sedimentary Petrology Lecture 15: Moscow Landing (Field Trip Background) Objectives (of the excursion): Examine the geology of the Moscow Landing K-T exposure (take field photos and samples etc.) Produce a detailed series of sedimentary sections (5) (and correlate them) Produce a 5-10 page paper about the outcrop including a small (individual) research focus (e.g., paleontology, structure, petrography, geomorphology etc.) Note: the bulk of your paper will concentrate on the stratigraphy and sedimentology of the outcrop, but feel free to discuss the controversial nature of the outcrop as well. Moscow Landing, Alabama Photo credit: Jan Smit (http://www.geo.vu.nl/~smit/indexjansmit/jansmitindex.htm) (http://www.geo.vu.nl/~smit/indexjansmit/jansmitindex.htm) Alabama Moscow Landing Paleozoic & older outcrops Moscow Landing Moscow Landing Coastal Plain (Mesozoic & younger) Moscow Landing Moscow Landing Location Map Moscow Landing 1 km Moscow Landing Location Map Moscow Landing 1 km Moscow Landing Stratigraphy basal Clayton sand Section from Smith (1997) Moscow Landing Stratigraphy basal Clayton sand Faults truncated at contact & soft sediment deformation (slumping) Section from Smith (1997) Moscow Landing Stratigraphy basal Clayton sand T K Section from Smith (1997) Beasties from ZoomDinosaurs.com 65 Ma The K-T impact Moscow Landing 1200 km Chixulub Art by Don Davis (www.donaldedavis.com) Gravity Map from Jan Smit's homepage, Smit' courtesy of A.Hildebrandt The K-T impact (ejecta blanket) Source: Jan Smit (http://www.geo.vu.nl/~smit/indexjansmit/jansmitindex.htm) (http://www.geo.vu.nl/~smit/indexjansmit/jansmitindex.htm) The Geology of Moscow Landing: Two basic sedimentary facies: 1: chalk (bioturbated with occasional shell layers) 2: sand +/- conglomerate (well sorted to muddy, bioturbated with large "breccia" blocks of chalk and disseminated shells) Chalk Facies Porters Creek Formation (Tertiary) Prairie Bluff Formation (Cretaceous) From Smith (1997) 1m Prairie Bluff Formation Prairie Bluff Formation burrows K-T Contact 1m K-T Contact 1m Sand (conglomerate) Facies Porters Creek Formation basal Clayton sand Prairie Bluff Formation From Smith (1997) basal Clayton Sandstone basal Clayton Sandstone basal Clayton Sandstone Pinch out basal Clayton Sandstone Basal Clayton Sandstone Basal Clayton Sandstone Angular to subrounded boulders of chalk up to 1.5m in size The controversy... basal Clayton sand From Smith (1997) The controversy... basal Clayton sand From Smith (1997) The controversy... basal Clayton sand ...just how old is this "sand" unit? From Smith (1997) The controversy... Hypothesis 1: Sand is Paleocene (post-impact, lag associated with an unconformity) basal Clayton sand From Smith (1997) The controversy... Hypothesis 2: Sand is terminal Cretaceous in age (impactgenerated tsunamiite) basal Clayton sand From Smith (1997) Hypothesis 1:Sand is Paleocene Hypothesis 2: sand is a tsunamiite Hypothesis 1:Sand is Paleocene Hypothesis 2: sand is a tsunamiite 3-3.5 million years of missing time Hypothesis 1:Sand is Paleocene Hypothesis 2: sand is a tsunamiite There is no missing time at the K-T boundary (or it is only minor) Upcoming Stuff Homework 1) Mid term exam due today by 5:00 PM 2) Immature Siliciclastic Petrography (due today) 3) St Stephens Quarry section due tomorrow Lab Today 1) Library lit. review assignment (Due Tuesday March 22 by 2:00 PM) Next Week: Spring Break (woo hoo!) Upcoming: Grain size project redos (due Friday March 25th) ...
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This note was uploaded on 02/05/2012 for the course GLY 402 taught by Professor Staff during the Fall '11 term at S. Alabama.

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