Changes

Magellans and GPS positioning devices offer a handy way to find your location with respect to surface maps. Latitude and longitude coordinates are read from a lightweight, hand-held device that determines position by triangulating with functioning satellites overhead. Coordinates are particularly useful when making numerous road stops and can be input into a computer for plotting.

Magellans and GPS positioning devices offer a handy way to find your location with respect to surface maps. Latitude and longitude coordinates are read from a lightweight, hand-held device that determines position by triangulating with functioning satellites overhead. Coordinates are particularly useful when making numerous road stops and can be input into a computer for plotting.

==Outcrop gamma-ray logging==

==Outcrop [[Basic open hole tools#Gamma ray|gamma-ray]] logging==

Outcrop gamma-ray logging can be a valuable technique for stratigraphic correlation. It allows a quantitative tie between surface and subsurface using a measurement common to both: the gamma-ray curve. This kind of tie can be more credible than “jump correlating” (identifying events on noncontiguous seismic records or lithologic horizons on well logs, separated by distance, as the same or correlative interfaces in the earth), particularly when significant distance is involved.

Outcrop gamma-ray logging can be a valuable technique for stratigraphic correlation. It allows a quantitative tie between surface and subsurface using a measurement common to both: the gamma-ray curve. This kind of tie can be more credible than “jump correlating” (identifying events on noncontiguous seismic records or lithologic horizons on well logs, separated by distance, as the same or correlative interfaces in the earth), particularly when significant distance is involved.