# Geomaps

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 Author: Twigley ID: 89299 Filename: Geomaps Updated: 2011-06-05 17:08:25 Tags: Geomaps Folders: Description: Geomaps Show Answers:

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1. How are these beds inclined, in general, and relative to the contour lines?
They are horizontal, and so follow the contour lines.
2. On a map, these horizontal beds appear to what upstream?

Horizontal beds V upstream. But follow contours.
3. How are these beds inclined and how can you tell?
The beds are horizontal. They follow the contours.
4. What shape is this structure - how is it dipping? How can you tell?
This is a vertical sheet - a dyke. It is not deflected or distorted by topography because it is going straight down into the ground.
5. What is the attitude of the rocks H2, H3, H4 How can you tell?

They are steeply/sub vertically dipping -so are not distorted by topography.
6. Dipping planes V in which direction as they cross high ground, such as a ridge?
They V up dip.

7. Planes that dip up-valley V which way in river valleys?
Strata that dips up stream V's upstream
8. A bed dips upstream at a steeper gradient than the river bed... describe its outcrop.
The outctop will V upstream, but the 'arms' of the V will make a wider angle than the contour lines of the valley walls...

9. A bed dips upstream, at a gradient lower than the river bed. Describe its outcrop.
The outcrop will V upstream. But the interlimb angle of the V will be tighter than that of the valley-wall contours.

10. A bed dips downstream at the same gradient as a the river floor. What will it's relationship be to the contours on the map?
It will cut straight through contours. Similar in some ways to a vertical dyke. But - it will be recognisable by its context (in a river valley) where it will follow the river trace.

11. What will the outcrop pattern be across a river valley if a bed dips more steeply than the valley?
It will V downstream.

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