Geocene Auckland GeoClub Magazine Number 23, July 2020 Editor: Jill Kenny CONTENTS Instructions on use of hyperlinks last page 26 A CURIOUS CASE OF RIVERBED POTHOLES IN Michael Coote, Kent Xie 2 – 6 WEST AUCKLAND GRANITE FLUTING, BASINS AND TAFONE ON Lee Sawyer, Ken Smith, 7 – 10 SOUTHERN STEWART ISLAND Bruce W. Hayward EVIDENCE FOR TUFFS AT MANGAWHAI HEADS Garry Carr 11 – 13 EXHUMED LAVA CAVE AT KERIKERI, NORTHLAND Bruce W. Hayward 14 – 15 A RECORD OF THE DISTINCTIVE BRYOZOAN GENUS Seabourne Rust 16 – 18 RETELEPRALIA FROM THE EARLY MIOCENE WAITIITI FORMATION OF NORTHLAND, NEW ZEALAND IHUMATAO ROAD END FOSSIL FOREST Bruce W. Hayward, 19 – 21 Maureen Burke RAFTS OF PLEISTOCENE SEDIMENT IN Bruce W. Hayward 22 – 25 PUPUKE VOLCANO LAVA FLOWS Corresponding authors’ contact information 26 Geocene is a periodic publication of Auckland Geology Club, a section of the Geoscience Society of New Zealand’s Auckland Branch. Contributions about the geology of New Zealand (particularly northern New Zealand) from members are welcome. Articles are lightly edited but not refereed. Please contact Jill Kenny
[email protected] 1 A CURIOUS CASE OF RIVERBED POTHOLES IN WEST AUCKLAND Michael Coote Map and photographs by Kent Xie Natural rock potholes at Woodside Reserve, Swanson two or more underlying, often oblique potholes, totalling During the COVID-19 lockdown period, local exercise up to about 1 m in depth in the biggest example. was promoted as official government policy. This situation encouraged the authors to look up maps for local The majority of the potholes were filled with water, but walkways, rights-of-way and reserves not previously most were above the water level of the stream.