EXERCISE 8.3: Fill in the blanks to formulate a series of rules to help in the i
ID: 288732 • Letter: E
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EXERCISE 8.3: Fill in the blanks to formulate a series of rules to help in the interpretation of geologic maps and cross sections. (4 pts) a. The following rules refer to relative ages of sedimentary beds. Choose older or younger for your answers When anticlines and domes are eroded, the beds exposed in the centre are the beds exposed away from the centre . than .When synclines and basins are eroded, the beds exposed in the centre are than the beds exposed away from the centre .On a geologic map, beds dip under (or toward) beds, unles they are overturned. (use your logic) b. The following rules refer to beds and contacts between beds, as seen in map view folds have been eroded, the contacts between beds, as seen on a When horizontal surface, are straight and parallel. Choose plunging or non-plunging . When plunging anticlines have been eroded, the contacts between beds, as seen in map view, bend so as to point the direction of plunge. Choose toward or away fronm . When plunging synclines have been eroded, the contacts between beds, as seen on the surface, bend so as to point as above) the direction of plunge. Choose toward or away from. (see as the angle between the surface and the dip of the The outcrop width of a bed bed decreases. Choose increases or decreases (use your logic) . /7pts 2Explanation / Answer
A) In Anticline( where both the limbs dibs away from each other ) structures older beds are at the center or core of the features. hence - OLDER
In syncline ( where both limbs dips toward each other ) strucutres older beds are away from the center and younger bed is at the core.- Younger
On a geological map Older beds dips under or towards younger beds unless they are overturned.
B) when non plungng folds are eroded , the contacts between beds as seen on a horizontal surface are straight and parallel.
when plunging anticlines are eroded the contacts between beds as seen in a map view , bend so as to point towards the direction of plunge.
when plunging syncline have been eroded the contacts between beds as seen in a map view , bend so as to point away from the direction of plunge
if the thickness of a bed is constant , the width of outcrop varies with dip angle. It is minimum when the bed is veritcal , being in fact equal to the true thickness of the bed, and as the dip decreases the width of outcrop increases.
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