I know this is more broadly a field of active study and there is a relatively new method of analyzing cosmogenic nuclides to determine for what duration a surface has been exposed to cosmic radiation.

Broadly how this works is that surfaces exposed to cosmic radiation start to develop an isotopic signature, to the degree that you can tell how long a boulder has been exposed to the open sky (within a margin of error).

Joerg M. Schaefer of Lamont-Doherty Earth Observatory explains in Glacial Landscape (Cosmogenic Nuclide) in the Encyclopedia of Scientific Dating Methods:

High-sensitivity cosmogenic nuclide techniques applied to the moraine record now afford for precise reconstruction of past glacier fluctuations with centennial resolution and on a time scale ranging from decades to beyond 100,000 years. It has been a long-standing dream of geologists and climate scientists alike to precisely map land ice change during the last ice age through the deglaciation period and into the current interglacial, referred to as the Holocene.