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Flashcards in Unit 4 Deck (26):
1

Littoral

Between the high and low tide lines

2

Sublittoral

Below the low line to approximately 200 m. This roughly corresponds to the Continental Shelf area

3

Bathyal

Between 200 and 2,000 m. This is rough;t the continental slope area

4

Abyssal

Greater than 2,000 m of water. This is the deep ocean floor.

5

Lithofacies map

Show the distribution of lithofacies for a time-rock unit.

6

Isopach Map

Show thickness of time rock units

7

Paleogeographic Maps

Used for constructed using the data found on lithofacies and isopach maps.

8

Depositional Zero Lines

In clastic sediments thick deposits near coarse clastics near the zero line generally indicates a depositional sedge. In carbonates look for indications of shore line

9

Erosional Zero Lines

Abrupt changes from marine facies to zero. Also a thining to zero within a single facies.

10

Contour Lines

Primary means of describing the earth's surface in map view

11

Natural features

Including streams,lakes and forests

12

Cultural features

roads, buildings and cemeteries are shown on topographic maps

13

What elevation is sea level

0

14

Index Contour

Every 5th contour

15

Contour Interval

The difference in elevation between two adjacent contour lines

16

Do contour lines cross

No unless merged in a vertical or overhanging cliff

17

Do contour lines split

Never

18

What do closed contours represent

Hills

19

Hachures

Short lines that are perpendicular to the contour

20

What do closed contour with hachures represent

Depression

21

What is the contour "V" represent

upstream

22

Where do "v's" point?

Uphill direction

23

Where do streams flow?

Downhill

24

Step Slopes are represented by

closely spaced contour lines

25

"V" in uphill direction

cross stream or valley

26

"V" in downhill direction

cross a ridge