Comparative plots of exposure-age results derived from different scaling schemes:

What is this?

These are 3-dimensional contours of the ratio between exposure ages derived from two different scaling schemes.

For example, if t(St) is the exposure age derived from the Stone(2000) scaling scheme, and t(De) is the exposure age derived from the Desilets (2006) scaling scheme, then the plot entitled St/De shows 3d contours of the ratio t(St)/t(De).

The GREEN contour connects points where t(St) = t(De), the RED contour bounds the region where t(St)/t(De) > 1.1 (i.e., St scaling scheme yields ages 10% higher for a site at this location and age), and the BLUE contour bounds the region where t(St)/t(De) < 0.9 (i.e., St scaling scheme yields ages that are 10% lower).

So what this is saying is that the St scaling scheme will yield much older ages than the De scaling scheme at low latitudes, high elevations, and long exposure times.

The white dots show the locations and ages of the samples used to calibrate all of the scaling schemes.

These plots are for 100 W longitude, i.e. the Americas. Other meridians would differ in detail but give the same general picture.

Questions about this page? Greg Balco,

Full set of comparisons:
Scaling scheme: Lal(1991) -
Desilets(2006) Dunai(2001) Lifton(2005) Time-dependent
Lal(1991) -
Lal(1991) -
-- St/De St/Du St/Li St/Lm
Desilets(2006) De/St -- De/Du De/Li De/Lm
Dunai(2001) Du/St Du/De -- Du/Li Du/Lm
Lifton(2005) Li/St Li/De Li/Du -- Li/Lm
Lal(1991) -
Lm/St Lm/De Lm/Du Lm/Li --