geographic range

noun

, Navigation.

the distance at which a certain light, as that of a lighthouse, is visible to the eye at a given elevation, assuming that the weather is clear and that the light is sufficiently powerful to be visible from any point at which it appears above the horizon.

Dipodomys ordii oklahomae is, for some unknown reason, restricted to a limited geographic range.

It would be interesting to study the significance of this character to learn if each form has a geographic range.

The probable geographic range of each species and subspecies is shown on one of the maps.

The eastern extent of geographic range is not known (see map, Fig. 22).

Of T. muticus, whose geographic range is removed from that of ater, there are two subspecies.

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