

624 RECORDS OF THE S.A. MUSEUM 
study of Pleistocene time, issued by the Ray Society, concluded that eustatic 
interglacial terraces were world-wide phenomena. He indicated relatively close 
agreement between the heights of principal terraces observed on stable foreshores 
in places so far removed as North America, North Africa, the Italo-French 
Riviera, the Sunda Tslands and South Australia, He adopted as type names for 
the main interglacial terraces, those first determined in the Mediterranean area 
by Depéret (1906, 1918), Tentative correlations given by him as between his 
type terraces and the South Australian ones of Tindale were as follows: 
Type names for 
interglacial terraces Average heights Sth. Aust, interglacial Observed heights 
(Zeuner) (metres). terraces (Tindale), (metres). 
Sicilian 100 Naracoorte 1 
(80) (75) 
Milazzian 60 Cave 60 
(45) 
Tyrrhenian 32 Hast Avenue 27* 
Main Monastirian 18 West Avenue } 19-5 
Reedy 
Late Monastirian 75 ‘Woakwine 7:5 
Present 0 Recent 0 
* 27 metres as quoted by Zeuner, but 45 metres in the original paper; the latter height 
was revised by Crocker and Cotton (see below) to 32-34 metres, 
On the evidence of submarine terraces and the data deduced from the benches 
of the lower courses of several European rivers Zeuner (1945) came to the 
conclusion thai phases of low sea level, characteristic of glacial periods, separated 
more than one, and probably all, of the above interglacial high terraces. 
The astronomical theories of Milankoviteh (1930, 1938) on the fluctuations of 
solar radiation due to perturbations of the earth’s orbit, as reapplied by Zeuner, 
gave him an explanation for the remarkable alfernations of glacial and inter- 
glacial climate characteristic of the Pleistocene, 
Spitaler (1939) obtained some different results for the variations of solar 
radiation, after some earlier calculations of his had been disputed by Milankoviteh 
(1938 (2), p. 639). Zeuner named several mathematicians who supported the 
Milankovitch calculations and using this data attempted an absolute chronology 
for the Pleistocene period, Whether Zeuner’s absolute chronology will, in detail, 
stand test is not certain; the principal outlines seem consistent with conclusions 
of several independent fields of geological study, 
Allowing for differences in detail it would appear now to be tolerably certain 
