GEOL LB 1

how much of the parent isotope would be remaining after 7 half lives have passed

.78%

based on your graph above approximately how many half lives have passed when only 35% of the parent isotope is remaining

1.5

the geologist determines there is 78.3% of the parent remaining in the sample that they examine. how old is the sequence of rocks

1.588 billion yrs

the archeologist determines that there is 16.7% of the parent isotope remaining in the cloth sample. How old is the burial site?

14,798 yrs

if a radiometric element has a half life of 425 yrs, how old would a rock be that only had 3.125% of the parent isotope remaining

2125 yrs

based on your graph approximately how much of the parent isotope would be remaining after 3.5 half lives

8%

which organism was the most useful in coming to this conclusion (best fossil index)

ambonychia

examine the unconformity shown in figure 1.10. what type of unconformity is this

angular unconformity

in figure 1.8 which of the following rock layer is oldest

b bottom

an archeologist finds some cloth at a burial site and wants to determine the age of the remains. which isotopic system should they use

carbon 14

based on the assemblage of organisms (A-I) in this sample, what is the age of this rock

fairmount

which of the above geologic events is fifth in the sequence

fault

which organism was the least useful in coming to this conclusion (worst index)

isotelus ???

which geologic law did you use to come to the conclusion you made in the previous question

law of cross cutting

which geologic law did you use to come to the conclusion you made in the previous question

law of superposition

which of the above geologic events is seventh in the sequence

submergence and deposition of sedimentary layers 10-13

examine unconformities 1 & 2 indicated in figure 1.9. which of the following statements about them is true

the older unconformity is a Nonconformity, while the younger is an Angular Unconformity

which of the above geologic events is the second in the sequence

tilting ???

in figure 1.9 which of the following geologic structures is youngest

unconformity

a geologist is trying to date a sequence of sedimentary rocks with abundant fossils and sandstones. within the sequence is a distinctive clay layer that under closer inspection is fine grained volcanic ash. which of the following is the best way to obtain an absolute date for the sequence of rocks

uranium date the zircons in the ash