#1 In the Death Valley photograph (below), which rock unit is younger, the tilte
ID: 110397 • Letter: #
Question
#1 In the Death Valley photograph (below), which rock unit is younger, the tilted gray layers or the upper layer with the angular clasts? In the Death Valley photograph (below), which rock a. The upper layer with angular clasts, because it contains clasts of the tilted layers and it is above the tilted layers. b. The upper layer with angular clasts, because the clasts are angular and it is not tilted. c. The tilted gray layers, because the layers are tilted and eroded. d. The tilted gray layers, because the layers are lower and do not contain clasts.
#2 If you found a place where a marine mud layer overlies a beach sandstone, do you think that sea level was rising or dropping (transgressing or regressing)? a. Dropping, regressing b. Dropping, transgressing c. Rising, transgressing d. Rising, regressing #3 In the Hance Rapids photograph (below), what is the oldest rock unit and why? In the Death Valley photograph (below), which rock a. Rock unit 3, because it's the darkest b. Rock unit 2. beacuse it cross cuts 1 and 3 c. Rock unit 2, because it cross cuts rock unit 1 d. Rock unit 1, because it is the lowest
Explanation / Answer
Answer:1
As we can see in the figure, the clasts are in angular form means they transported from some short route and may be it came along water agencies in valley. Therefore, the upper layer with angular clasts are younger, because the clasts are angular and it is not tilted. Hence, option A would be correct.
Answer:2
Transgression means rising of sea water for a long time, and characterized by the presence of coarse grain facies at near shore region and fine grain facies towards deep sea region. And according to condition mud are placed over beach sandstone means sea level rising. Therefore, option C, Rising, transgressing would be correct.
Answer:3
Older and younger sequence of rocks can be classify on the basis of their place in strata. Lower most one's are oldest and upper most one's are youngest. Therefore, rock unit 1 would be oldest as it is lowest in sequence. Hence, option D would be correct.
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