176 Transactions. 



greensands, its normal position as shown by Park in his section at All Day 

 Bay (p. 56). The writer (1918b, p. 121) described this locality, and showed 

 that the " jparki " band lay some distance above the limestone, which was 

 nodular at its surface, and according to Park the upper part of the limestone 

 is " a hard semi-crystalUne limestone from 2 ft. to 4 ft. thick." The sequence 

 is similar to that at All Day Bay, although the small exposure of looser 

 greensands between the nodular surface of the limestone and the " farTci " 

 band has not yet proved fossihferous. The sands above the '' parki" band 

 are glauconitic, and in this respect are similar to the Awamoan at All Day 

 Bay. In the present locality no reasons have been adduced to show that 

 the Upper Hutchinsonian is present. 



All the localities in the Oamaru district where Park has described the 

 Hutchinsonian have now been discussed, and the writer has attempted to 

 show that the band of glauconitic sandstone (the so-called Upper Hutchin- 

 sonian of Park) is part of the Awamoan. The description in Bulletin No. 20 

 of the Awamoan beds shows that they may assume the character of an indu- . 

 rated sandstone. In the^ absence of palaeontological evidence, the placing 

 of a thin band of sandstone in an Upper Hutchinsonian is unwarranted. 

 The fossils that have been recorded by Park are Awamoan, as shown 

 above. In his classification of the beds of north-east Otago, Thomson (1916, 

 p. 35) defined the Hutchinsonian as the beds lying between the Ototara 

 imestone and the shell-bed at Target Gully. This shell-bed undoubtedly 

 forms the base of the Awamoan at the Rifle Butts, but from its very nature 

 t is not likely to be a widely extended horizon (it is known to occur at only 

 three places— Rifle Butts, Target. Gully, and Ardgowan). These shell-beds 

 appear to be the remains of shell-banks of the Awamoan seas, and, although 

 confined to the lower part of the Awamoan, they may not always represent 

 the basal bed. At All Day Bay the basal bed of the Awamoan, which lies 

 directly on the " parki " band (Hutchinsonian), contains similar fossils to 

 the shell-bed, but no shell-bed occurs in the locality. As pointed out above, 

 the " parki " band marks a definite horizon, the close of the Hutchinsonian, 

 and it seems preferable to make this band the upward limit of this stage. 

 This would mean that Park's Waitaki stone (Upper Hutchinsonian) would 

 be driven into the Awamoan, but it would not in any way lower the value 

 of the evidence he has brought forward to prove that this limestone is at a 

 different horizon from the Ototaran stone. 



(10.) Landon Creek and Flume Creek. 



The Awamoan beds are not present in these localities, but certain hard 

 glauconitic bands are present in the upper beds. Some of these are referred 

 to the Upper Hutchinsonian horizon. The present writer contends that 

 these so-called Upper Hutchinsonian bands represent the " parki " band, 

 in other cases lower beds, and are therefore, according to Park's definition, 

 his Lower Hutchinsonian. As the "'parki'' band is the highest horizon in 

 the Landon Creek and Flume Creek areas, the so-called Upper Hutchin- 

 sonian cannot be present. 



In fig. 25 (p. 63) a section is given showing "rusty-brown glauconitic 

 greensands crowded with Pachijmagas parki (Hutt.) " at the top of the 

 sequence. According to Park's definition, this is his Lower Hutchinsonian 

 horizon, and the Upper Hutchinsonian cannot be present. We must note, 

 however, that a " brown calcareous glauconitic sandstone " 6 ft. thick is 

 said to lie 4| ft. helow the " parki " bed. This band of sandstone is again 

 shown in fig' 26, where the ''parki" band is not shown. In both figures 



