30 R.W. JONES AND M.D. SIMMONS 
A GLACIAL - TRANSGRESSION INTERGLACIAL - REGRESSION 
e Rivers frozen. Extensive Permafrost. e River Systems Reactivated. 
¢ Sediment Supply < Subsidence. ¢ Evaporation > Precipitation / Runoff. 
e Expansion of 'Cool' Zone. e Expansion of 'Warm' Zone. 
MONTANE EMI 
VEGETATION SERT 
B GLACIAL - REGRESSION INTERGLACIAL - TRANSGRESSION 
e Water locked up in Ice Sheet. e Water released from melting Ice Sheet 
¢ Pollen Spectra of Arid Aspect. e Expansion of Forest Zone 
* Contraction of Forest Zone 
Fig.4 Response to glaciation — alternative models for the Caspian. A: glacial transgression/interglacial regression. B: glacial regression/interglacial 
transgression. B better follows the palaeoclimatic reconstruction data given by Grichuk (1984) (see text). 
