Unit 4 Flashcards
Littoral
Between the high and low tide lines
Sublittoral
Below the low line to approximately 200 m. This roughly corresponds to the Continental Shelf area
Bathyal
Between 200 and 2,000 m. This is rough;t the continental slope area
Abyssal
Greater than 2,000 m of water. This is the deep ocean floor.
Lithofacies map
Show the distribution of lithofacies for a time-rock unit.
Isopach Map
Show thickness of time rock units
Paleogeographic Maps
Used for constructed using the data found on lithofacies and isopach maps.
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
Erosional Zero Lines
Abrupt changes from marine facies to zero. Also a thining to zero within a single facies.
Contour Lines
Primary means of describing the earth’s surface in map view
Natural features
Including streams,lakes and forests
Cultural features
roads, buildings and cemeteries are shown on topographic maps
What elevation is sea level
0
Index Contour
Every 5th contour
Contour Interval
The difference in elevation between two adjacent contour lines
