Benson.—Structural Features of the Margin of Australasia. — 111 
of crust-movement in Celebes becomes greater when it is compared with 
the similar late Tertiary and Pleistocene movements in New Guinea and 
New Zealand. 
seems desirable here to note Professor Molengraaffs most recent 
generalizations (1922) concerning the tectonics of this region, as they show 
the manner in which Wegener's (1920) views have been applied to its 
explanation. (See also Wing Easton, 1921).  Molengraaff holds that the 
arcs of the Malayan Archipelago originally formed a much more regularly 
curved series of arcuate folds concave towards Asia, of the structure of 
which they formed the marginal parts. On the basis of Tydeman's 
bathymetrical charts he would trace the easternmost anticlinal fold in 
‘Mindanao into the north-eastern arm of Celebes, and thence by the south- 
rn arm into the Tukang Besi Islands, crossing a deep and narrow 
sharp fracture and lateral dislocation of the anticlinal 
gripped in the concavity of the coast-line (Arafura Bight) ”—i.e., the 
margin of the continental mass as indicated by the position of the hundred- 
fathom line. ‘‘ Through this [movement] the folding arcs of the Moluccan 
overthrustings going out in a centrifugal direction from the central Banda 
and dislocations of these anticlinal ridges are explained as the result of 
has been noted. Attention must now be called to Gregory’s (1923) recent 
papers. After citing Suess’s opinion and Boehm’s general adherence 
thereto, he adds: “ The geological evidence appears consistent with [this 
opinion]. The Tenimber Islands have been shown by Professor Brouwer 
Kei Islands also the strike of the older and more steeply tilted beds 
trends east and west (Verbeek, 1908, pl. xv, figs. 421, 431, 440), and is 
part of the general east-to-west grain of this region, and is older than the 
