Transcript Document
The rubric you used and the more-or-less likely one for my grading • _____/5 “logistics” Title, scale (bar and ratio), author, date, N arrow, explanation (rock units (oldest at the bottom) with symbols and ages, strike and dip, contacts, structures (faults/folds)) • _____/3 strikes and dips on bedded rocks • _____/10 appearance (neatness, spelling, correct line weights, color LIGHTLY, symbols in all the rock units, no eraser marks everywhere) • N is to the top of the page AND all writing on the map is up to the north ______/18 TOTAL POSSIBLE Nancy who? date Which way is N? Way too heavy lineweight Only one??? Whats on The other side? EXPLANATION (Symbols) ORDER!! And ages ? ____ ? N ratio scaleSome title! TOO Dark and unlabelled Need the WHOLE contact And move to top of page Topo base from SP Crater 7.5’ quadrangle ABSTRACT _____/2 title _____/3 location _____/5 rock types _____/10 volcanic/structural evolution The abstract summarizes the entire paper. It may be called an “executive summary” in some cases. It should not be a detailed, blow-by-blow description of every single aspect of the paper, but it should contain enough information that the reader will gain an appreciation for what the paper is about. It should tell what the study is about, why it was done, and what the main conclusions are. An abstract does NOT need to include details of location, but it should include concise descriptions of the RESULTS of your work. Thus “The rocks at SP Crater were studied” is NOT acceptable, but “Rock types at SP Crater include Triassic alluvium, Precambrian basalt, and Ordovician mudstone” is great (the difference? the first tell me what you did, which is obvious anyway, and the second tells me what you found, which is what I’m after). So, you will want to include a few words about where SP Crater is (three to five words, after “is located”), the rock types (in stratigraphic order please), and the distinguishing features of the volcano and the area. AVOID THE PASSIVE VOICE as much as possible (what are better ways to say “the basalt was seen” or “phenocrysts of olivine were found”?). Structure and stratigraphy of the Lake Mary area by GLG 240 Lake Mary is located ~ 16 km southeast of Flagstaff, AZ, along Lake Mary Road. The rock layers are flat lying and include Permian Coconino Sandstone, Permian Kaibab Limestone, Triassic Moenkopi Formation, and Tertiary basalt. The Coconino Sandstone is cross bedded and friable. Grains are medium to coarse, well sorted, and rounded. Cross bedding varies from high to low angle and is in several directions. The Kaibab Limestone is well cemented and massive. Weathered surfaces are strongly pitted and the rock effervesces in HCl. The Moenkopi Formation consists of layers of differing resistance to weathering and thickness. Thicker, more-resistant layers are coarser than thinner, less-resistant layers. Lenses of platey siltstone are rarely cross bedded. Basalt disconformably overlies the Moenkopi Formation with an intervening baked soil horizon. The valley in which Lake Mary lies is an example of a graben structure. A drill core taken from Lake Mary shows that the stratigraphy below Lake Mary matches that of outcrops on the mesas on either side of the lake. Joints in the Kaibab Limestone parallel the fault on the northeastern side of the graben. Paleozoic and Mesozoic rocks were deposited in environments that varied from eolian (Coconino Sandstone) to marine (Kaibab Limestone. Tertiary basalt was derived from an unknown vent in the San Francisco Volcanic Field. Faulting occurred after emplacement of the basalt, although precise timing is unknown.