Liam Murphy - GEOL200 - Lab Assignment 03 [Marked]

.pdf

School

University of New Brunswick *

*We aren’t endorsed by this school

Course

200

Subject

Geology

Date

Oct 30, 2023

Type

pdf

Pages

Uploaded by UltraFinchPerson350

Liam Murphy 3540040 GEOL 200 - Introductory to Physical Geology Lab Assignment #3 July 28™", 2021 Liam Murphy GEOL 200 Athabasca University i [ Complete Activity 6.1A on page 169 of the Laboratory Manual. A. Analyze the sedimentary rocks below. Below each photograph des!crlbe %nef’lefi the rocks composition (what it is made of) and texture (the size, shape, and arrarig*eme'nt ofits pah g IPEPIL W LYY Y i, s 5% va e & 1t P% oY Csarvation: dost nof gz i 408 . Samgle #: - 1 Sample #: 2 . Colﬂngas:tn:an'x T Comgosmon ‘ ' I This rock appears to be made upbf mostly pebbles (4- 64mm) that are cemented together. :Coarse’ grained rock cerhpns‘ed mostly of What appear to be shells sitting within the pebble size range (4-64mm) and all are cemented together. Cube shaped gran( all appearing to fit within the granules size range (2-4mm). This crystal has completely intergrown without cementation. Texture . Size: - Pebbles (4FG4mm)», Texture P TT Shapefi,{i 5« oy Subro! ound - :% . iaadt b Sat *Size: . LEltew Pebt;les (4- 64mm) ' * Arrangement: Poorly éofied 2 Shape L *Subangular Arrangement: Poorly Sorted L) i)*mrmmr:a z}m 'zi:xi % wery fine graned % Sample #: Sample #: 4 Composition: Cv i S 3 Composition: %L\ Rock showing almost perfect planes of cleavage so that thi particular rock will split apart in sheets (almost like a sl F ine grained rock where partlcles are not visible to the naked eye, rock would fit in the clay size (<1/256mm). 'k Wheds ad Texture Size: Granules (2—4mm) Texture Shape: {e Size: Clay (£1/256mm) i Arrangement: Well Sorte Shape: Well rounded ,—\( OM i H’Vﬂ) cY L{ S \(dj \R L) Arrangement: Well Sorted ‘\‘KMS A Unit 4: Weathering, Soil, and Sedimentary Rocks. Lab Assignment #3 Page 1 of 6 July 28%, 2021

Dbwereations: it fiez ub: grains average ~01.5 mm Glagreter Csprvation: Hizres in aiig Sample #: Sample #: 6 fi Composition: ifi 'qk"% Composition: : ssed ay an siits. asz up oi com Medium grain sand cemented together. Texture Size: <0.50mm (not.visble to Size: <0.50mm (not visble to the naked the naked eye) eye). Shape: Well Rounded ~ ¢+ (9 Shape: Well Rounded s Arrangement: Well Sorted Arrangement: Well Sorted M«)“r&\, 2. Imagine that you just found the rock pictured on page 149 of the Laboratory Manual. Such a rock could also be found in the Cretaceous rocks of Dinosaur Provincial Park in southern Alberta. a. Suggest a paleo environment that the sample represents, and explain your reasoning. ° Early Cretaceous, ~130M years ago. It appears there are large footprints embedded in the mud flats that wo 5 " gn with that of a dinosaur dating thisto early cretaceous to c[etaceous period. \ WL \Ps./\ o M§L Suary \acoome? \ecysirine w rwfe\QVM\' What evndénce&vould yot look for to suppoft your hypothes:s‘? e The presence of footprints within the mudflats indicating dinosaurs roamed across the flats, also any fossils that may be edded in the mudflats could give an indicatign to the p eo environment. \.M Qf\ QI%' ah qsuva, co V& Nyfi ‘3 {voer s\ &@SS({@M CVoc((_S 3. List the envuronments |n ich shale accumulates at does ea of thesé environments havé in common with the others? ° Lake bottoms. ° End of rivers in deltas. S e Riverflood plains. e Quiet parts of the deep ocean floor. e Al of these environments are not fast moving water areas. These areas allow the sediment (silt/clay) to settle to : the bottom of the body of water and slowly compact the fill below to a shale. If the water were fast moving the sediment will snmply ntinue being transported. 4 # Bay & 0 %1 ? b L] . 5 Pl 4 H » -~ " ’ yoa S K i ?. LN i . 7 5 1. S CRVI. R I F R MY : =0 s Wileoe A 2T 2In]E MY Liam Murphy Unit 4: Weathering, Soil, and Sedimentary Rocks GEOL 200 Lab Assignment #3 Athabasca University Page 2 of 6 July 28, 2021

Liam Murphy GEOL 200 150 M x* Pennsyiyaaaafi~age mck from f(a:;sas (2’9@ myr old} 4. Complete Activity 6.9 A and B on page 184 of the Laboratory Manual. A. Analyze photographs X and Y in the figure below of a Kansas rock and the modern day seafloor near Cape Cod, respectively. J Kl i 2 s ‘fi'rar"} ‘x‘i}‘é&i imgwents z,f i ; ¢ L&) vid fossit shells comprise the rock < K Mgcﬂmn seaﬂm 7 “environment, 40 m deap ~16 km north of Cape Cod, Massachusetts. Photo includes clastic sedimen from the continent, bioclastics,, and living organisms. » 1% gravel » 90% sand * 9% mud 1. How are the modern environment (photograph Y) and Kansas rock (photograph X) the same? S - ° Both photographs contain evidence of living organisms at one point. 4 2 .( o Photograph X shows fossilised starfish and Photograph Y shows living starfish on the ¢~ bottom of the seafloor. « Both photographs are close to the same colour. %?/\/V\K TW\Q LC&Q Cb KMW 2. How are the modern environment (photograph Y) and Kansas rock (photograph X) different? "Q’a 5 g e Photograph Y appears to have a smoother texture to that of Photograph X, maybe this could be down to the sea current constantly moving the sediment around and smoothing the seafloor. e Photograph Y does not show and visible “fossils” unlike Photograph X. O 3. Today, this part of Kansas is rolling hills and farm field. Describe the environment in which the sediment in this rock sample (photograph X) was deposited there about 290 million years ago. S ° This environment would have been a marine environment due to the presence of marine - organisms within the picture (starfish). 5. Consider the weathering and erosion of a granite. a a. Describe the physical and chemical changes that occur to produce a detrital sediment from a freshly o exposed granite. g f “a ) /) yart q 4 | At e ° Fresh Granite will find itgelfwut of equilibrium and will begin the weathering process. As weathering and erosion ; \ & wo Bk take place on the gramtewemovmg sediment from the source the rock will begin to break down into its raw 3 LN R mlnerals these raw mj ner s a thev(abl to form with other raw minerals to create new minerals {o beysed by orgamsm& \) \S¢ 5 (A onx ! e C o al \ «{ V‘\S\w‘l Wwead e QWM Unit 4: Weathering, Soil, and Sedimentary Rocks Lab Assignment #3 Athabasca University Page 3 of 6 ) July 28, 2021

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version