1. Mountains Part II
Domed and Fault-Block

2. Dome Mountains
Created when magma pushes up from underneath existing strata and cools.

4. Associated features:
A sill is an igneous intrusion that squeezes in between existing rock layers
Goes parallel to the layers
The cliff band on Triangle Mtn is a sill
A dike is similar but cuts across the existing rock strata
The belt on Mt Daly is a dike

6. Intrusive Magma:
Batholiths are large bubbles of magma (usually felsic) that cool underground.
Forms Tectonic Domes
Smaller bubbles are called Laccoliths- usually a sill that has bulged upwards.
Forms Plutonic Domes

7. Stock>

8. Domed mountains create:
Cuestas
Hogback ridges
Flatirons
Watergaps
Stocks

11. Dike
Dike
Sopris is NOT a volcano- It’s a stock!

12. Mtn Sopris = Stock

13. Flat Irons- Boulder

14. - closest = Grand Hogback near Rifle
Hogback- front range
- closest = Grand Hogback near Rifle
Henry Mtns- laccolith

15. Cuesta- Horse tooth Reservoir

16. Historic photo of the Grand Hogback- New Castle

17. How to tell the difference between a folded and a domed mountain?
If the mountain is folded, the underlying rocks will be either sedimentary or metamorphic
If the mountain is domed, then the rocks below will be igneous (intrusive/plutonic)

19. Fault-Block Mountain

20. Fault Block Mtns
Formed from blocks of crust that have been faulted and tilted at the same time.
Red Butte
Sangre De Cristos
Tetons
Sierra Nevada
Wasatch Mountains

21. Joints Rock layers may rupture from pressure applied.
Fractures where no movement has occurred are called joints,

27. Faults
Faults are fractures in the earth’s crust where movement has occurred.
There are three types: normal, reverse or thrust, and strike-slip (also called transcurrent).

33. Teton Mountains
The Tetons in Wyoming have been uplifted along a fault plane.

36. Basin and range

39. Mountain Ranges
Mountain ranges are formed when long belts of the earth’s crust are folded and/or faulted then are uplifted and eroded. The Rockies are an example.

41. Erosion
When a section of the earth’s crust is elevated, streams begin to erode deep channels.
Can form mountains also.

43. Capstones
Resistant layers help to produce mesas, buttes, and pinnacles.

46. Earthquakes
Earthquakes occur due to movement along faults.

50. Lake Baikal-. -deepest lake in the world. -5,315 feet deep
Lake Baikal- -deepest lake in the world -5,315 feet deep -contains 1/5 of all the world’s freshwater

51. Lake Tahoe