ANSWER SHEET A. Using the cross-section through Earth below, list the lettered r
ID: 115998 • Letter: A
Question
ANSWER SHEET A. Using the cross-section through Earth below, list the lettered rock units in order from oldest (bottom) to youngest (top). Start with the oldest. Youngest 1 Oldest-F- ROCK TYPES shale sandstone conglomerate diorite (gray outside contact indicates baked zone) basalt (orange outside contact indicates baked zone) granite siltstone The lawof_crosscutti- The Law ofCr after unit was deposited, but before unitwas deposited. rells you that Fault 1 moved What type of unconformity is between units E and R- Basalt V is younger than diorite D by the Law of The Law of and uf indicate that L is younger than D What type of unconformity is between units Mand inguley dis contor wmi What type of unconformity is between units L and B? DisconFermik ntar What type of unconformity is between units Wand R? Figure 5.6 Geologic History 55Explanation / Answer
Considering the relative age, the rock units arranged from youngest to oldest are :
1.Layer W
2.Unconformity
3.Layer R
4.Layer V
5.Unconformity
6.Diorite D
7.Layer B
8.Layer S
9.Layer M
10. Unconformity
11.Fault
12.Tilting
13.Layer K
14.Layer E
15. Unconformity
16. Layer F
The law of cross-cutting tells yo that the Fault 1 moed after Unit K was deposited and before Unit M was deposited.
Unconformity between E and F - Disconformity (erosional plane parallel to the bedding planes of upper and lower surfaces).
Basalt V is younger than Diorite D by the relation of cross-cutting.
The law of Superposition and Cross cutting relationship indicate that L is younger than D.
Unconformity between K and M - Angular unconformity (contact that separates a younger, gentle dipping rock unit from the overlying rocks that are tilted)
Unconformity between L and B - Disconformity
Unconformity between W and R - Angular unconformity
B.
Trilobites - Cambrian(521 million yrs ago) till Upper Permian (252 million yrs ago)
Fish- Devonian (417 to 354 million yrs ago)