Uttley. — Remarks on Bulletin No. 20. 175 



If, however, in addition to a molluscan fauna the brachiopods are present, 

 the line of demarcation is a sharp one in the Oamaru and Papakaio districts, 

 the close of the Hutchinsonian being marked by a giauconitic band crowded 

 with Pachymagas parki (Hutt)., which is often accompanied by Rhizothyris 

 rhizoida (Hutt.). The writer believes that the " parki " beds in the present 

 locality are followed directly by the Awamoan, and, as the former beds are 

 Park's Lower Hutchinsonian, it follows that there is no Upper Hutchin- 

 sonian in the Target Gully locality. Yet Park states (p. 25) that " on 

 palaeontological grounds the Hutchinsonian might be divided into two 

 sub-stages — the lower or true Hutchinsonian including the giauconitic 

 greensands, the upper comprising the giauconitic calcareous sandstone 

 that forms the Waitaki stone or Waitakian." The writer has been unable 

 to find in Park's latest work these palaeontological grounds. 



When the writer examined the Target Gully section the junctions of the 

 various beds were obscured by slope deposits, in which were collected fossils 

 from the shell-bed (Awamoan), specimens of Pachymagas parki (Hutt.), and 

 Rhizothyris rhizoida (Hutt.), and this would indicate that the true Hutchin- 

 sonian (Park's Lower Hutchinsonian) is present below the shell-bed. Putting 

 aside this obscurity of the section, however, it is contended that no evidence 

 has been adduced to justify any bed in the section being differentiated 

 as a separate Upper Hutchinsonian horizon. The fossils from bed c are 

 Awamoan, and the hard giauconitic sandstone is exactly similar to the 

 bands that occur in Park's Awamoan at All Day Ba}^ 



(7.) Upper Target Gully (p. 82). 



Two sections are exposed in this locality. In fig. 37 a " rusty-brown 

 giauconitic sandstone; 9ft. exposed; contains Pachymagas parki (Hutt)." 

 In fig. 38 a giauconitic sandstone is shown. It is said to be crowded with 

 Pachymagas parki (Hutt). According to Park's definition of the beds, 

 neither the Awamoan nor the so-called Upper Hutchinsonian is present. 



(8.) Ardgowan Shell-hed (p. 81). 



The section in this locality (fig. 36) shows the Ardgowan shell-beds 

 resting directly on a " soft brown sandstone," from which twelve fossils 

 were collected, eleven of which are found in typical Awamoan localities. 

 ThQ other fossil, Li^na suteri Dall, is apparently not found elsewhere in 

 the Oamaru district. Park's Lower Hutchinsonian is not present in the 

 section, and no reason is assigned for separating this " sUghtly giauconitic 

 sandstone " from the Awamoan. As pointed out above, these sandstone 

 bands are characteristic of the Awamoan, and there is no evidence to show- 

 why they should be placed at an Upper Hutchinsonian horizon. 



(9.) DeviVs Bridge (pp. 62, 82). 



The section at the outlet end of Devil's Basin shows " a soft friable 

 giauconitic sandstone, 12 ft. thick, crowded with Pachymagas parki (Hutt.)," 

 and accompanied by Rhizothyris rhizoida (Hutt.), overlain directly by a brown 

 calcareous giauconitic sandstone, 30 ft. thick, from which seventeen forms 

 were obtained, thirteen of which occur in the Awamoan, one is not found 

 elsewhere, two are recorded from the " Lower Hutchinsonian " elsewhere 

 (that is, from the ''^ parki'' greensands), while Emargimda wamwnensis Harris 

 occurs in the Ototaran. This so-called Upper Hutchinsonian cannot ,be 

 separated from the Awamoan, particularly as it rests hard upon the " parki " 



