BARTRUM.— Geology of Riverhead-Kaukapakapa District. 139 
The Geology of the Riverhead-Kaukapakapa District, Waitemata 
County, Auckland. 
By J. A. Bartrum, Auckland University College. 
{Read before the Auckland Institute, 19th December, 1922 ; received by Editor, 
31st December, 1922 ; issued separately, 26th May, 1924.] 
Plate 6. 
CONTENTS. 
Page : Page 
Introduction 2s v .. 139 | Detailed Stratigraphy—continued. 
Earlier Work .. E» xs Н) 3. Andesitic Conglomerate Form- 149 
Synopsis of Stratigraphy .. er i ation 
Detailed Stratigraphy— 4. Pleistocene and Recent Deposits 149 
l. Onerahi Seri 142 | Igneous Rocks is en MD 
2. Waitemata Series 144 
INTRODUCTION. 
the present one in this respect. Chemical weathering is particularly rapid 
in the warm, humid climate; there is a considerable depth of completely 
expenditure of labour entirely disproportionate to the results likely to be 
obtained, to discover any but the more obvious outcrops. 
