Simulating the Evolution of Fluid Underpressures in the Great Plains, by Incorporation of Tectonic Uplift and Tilting, with a Groundwater Flow Model

Table 3

The sequence of nine MODFLOW Models (m.y.: million years).

Sequence number of each model	Name of model	Time span (Ma)	Number of years modeled (m.y.)	Figure number showing grid
First	27 Ma	40 to 27 Ma	13	Figure 14
Second	18 Ma	27 to 18 Ma	9	Figure 15
Third	11 Ma	18 to 11 Ma	7	None
Fourth	7 Ma	11 to 7 Ma	4	None
Fifth	4.5 Ma	7 to 4.5 Ma	2.5	Figure 16
Sixth	3.5 Ma	4.5 to 3.5 Ma	1	None
Seventh	3 Ma	3.5 to 3 Ma	0.5	None
Eighth	2 Ma	3 to 2 Ma	1	None
Ninth	0 Ma	2 to 0 Ma	2	Figure 7