摘要:

Evolution of nautiloids during the Triassic is a culmination of trends established in the late Paleozoic. In the late Triassic, the group suffered almost complete extinction. In New Zealand, the meagre fossil nautiloid fauna is extremely important because it includes representatives of the stock which survived into the Jurassic.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423151

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Four species of Lower Triassic (Scythian) ammonoids are recorded from Malakoff Hill, Wairaki Downs, Southland. The assemblage (Owenitescf.O. koeneni, Flemingitescf.lidacensis, Subvishnuites welteri,andWyomingitescf.aplanatus) clearly indicates that the fauna belongs to theMeekoceraszone (approximately Mid-Scythian), The Lower Triassic (Scythian) formations of the Circum-Pacific Region are reviewed and their ammonoid faunas attributed to the zones and ages of the Scythian Stage.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423152

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

In southern Southland and south-east Otago on the southern limb of the Southland Syncline each axial trace of several minor folds is sharply flexured southward to strike north-south. As normal faulting in the area has had no effect on the axial traces of folds, except in the immediate vicinity of faults, and as late-Cretaceous to Recent folding has had little or no effect on the axial traces of folds, subsequent folding and faulting does not satisfactorily explain the flexuring. A working hypothesis of a regional flexure affecting the axial trace of the Southland Syncline and of the Otago Schist Anticlinorium is proposed. In Eastern Otago the strike of bedding in subschists and greywackes of the Tuapeka Series and of the “b” lineation of the Otago Schists supports the hypothesis, but not unequivocally so. Field confirmation of a regional swing of strike of bedding and lineation from south-easterly inland to south-south-easterly at the coast is necessary before a regional flexure is proven. It is conjectural whether the proposed regional flexure represents a permanent swing to the south of the post-Hokonui structures or whether it denotes a local regional buckling in the south-easterly trend. The alternatives should be considered in paleogeographic reconstructions of the New Zealand region.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423153

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The Lower Mesozoic alternating greywackes and argillites in the Porirua district exhibit graded bedding, lamination, convolute lamination, cross lamination, mud flakes, and current markings.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423154

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Low-level terraces built in bay heads along the eastern portion of the south coast of Waitemata Harbour are ascribed to sedimentation during Recent regimes of high sea-level. Submerged and infilled valleys of streams tributary to the ancestral Waitemata River are described.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423155

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Maccoyella incurvatan.sp. is described from Upper Jurassic or Lower Cretaceous rocks near Kahikatea Settlement, Opotiki district, Raukumara Peninsula.M. magnataMarwick is re-examined, and comidered to be possibly identical withM. reflecta(Moore).

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423156

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

In the lower Waipara Gorge, North Canterbury, sediments ranging in age from Awamoan to Holocene form a sequence about 4000 ft thick. There is an unconformity below the Waitotaran, and no Taranaki Series is present. Marine sedimentation gave way to nOh-marine about the beginning of the Nukumaruan. Two new formations are established; the Double Corner Shell-beds of Waiauan age, and the Greenwood Formation of Waitotaran to possibly Nukumaruan age. The marine sediments contain rich molluscan faunas.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423157

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

The well indurated greywacke-argillite rocks of the Porirua district have been subjected to strong folding followed by more than one period of intense faulting and fracturing. The main axis of flexural folding trends NNE-NE and plunges 14° to 17° NE. Numerous small-scale fold; are described. They exhibit a wide range of forms: from open, symmetrical, and faulted fold; to isoclinal folds. A few localized folds, described as incongruous, have axes that cut across the NNE-NE trending regional fold axis.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423158

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

Detailed reVISIOn of geologic maps, sections, and columns of Kamo Mine area are based primarily upon the interpretation of fieldwork and drilling, both before and after the complete flooding of New Kamo Mine in November 1955. The Kamo Coal Measures (Kaiatan-Runangan), Ruatangata Sandstone (Runangan), Whangarei Limestone (Landon), and Waitakian sandstones are referred to the Te Kuiti Gronp. The Onerahi Formation of Ferrar has been re-defined as comprising a chaotic assemblage of upper Cretaceous and Eocene argillaceous rocks, and much rarer Waitakian sandstones, that now overlies the Te Kuiti Group and probably the Parahaki dacites of about Taranaki age. This formation is considered to have been emplaced locally by gravity slumping, shortly after Kaikoura faulting. Its source was probably an overthrust, nappe, piercement, or diapiric structure to the west. Kerikeri basaltic volcanism followed the formation of a terrace at about 220 ft A.S.L. (Milazzian).

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423159

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor

摘要:

A foredune section at Pig Bay, Motutapu, has been excavated to expose nonvolcanic beach sand below a single Rangitoto ash layer which, illi turn, is overlain by a series of wind-blown and water-laid sediments containing reworked ash. The date of the eruption was determined by carbon sample; as A.D. 1188 ± 50 years. The sediments above the Rangitoto ash include a number of well defined human occupation levels, some of which have yielded adzes of moa-hunter type.

ISSN:0028-8306    

DOI:10.1080/00288306.1959.10423160

出版商:Taylor & Francis Group    

年代:1959

数据来源: Taylor