Ink and pencil on tracing paper, medium in detail, fair condition. - Observation measure: equal parts interpretation and observation. - Map size: 750 mm x 800 mm. - Notes: Companion to memorandum "Blocks VI, VIII & IX Wairio Survey District" 1951 by Bowen, Dunedin Office Techfile D45/361. Keywords: SOUTHLAND; WAIRIO; GEOLOGIC MAPS; COAL; RESINS; SHALE; TWINLAW: FAULT SCARPS; FAULTING; MCLEAN FAULT; WAIRIO FAULT; GORGE FAULT; STRUCTURAL GEOLOGY; MEASUREMENT; BEDDING; COAL MEASURES

Map on draughting cloth,with annotation in pencil, rich in detail, in good condition. - Observation measure: mainly interpretation. - Map size: B1. Keywords: TARANAKI; WANGANUI; GEOLOGIC MAPS; HAWERA; OHAKUNE

Map on transparency, medium in detail, in excellent condition. Observation measure: observation only. - Map size: A2. Keywords: THREE KINGS ISLANDS; GEOLOGIC MAPS; GREAT ISLAND

Stratigraphic section on ammonia print, rich in detail, in good condition. - Observation measure: mainly interpretation. - Map size: B2. - Coordinates give rough placement only. Keywords: CONWAY RIVER; AMURI; STRATIGRAPHIC SECTIONS; HAWKESWOOD RANGE; OARO RIVER

Map on ammonia print, with annotation in pencil, rich in detail, in fair condition. - Observation measure: mainly interpretation. - Map size: A1. Keywords: CONWAY RIVER; AMURI; GEOLOGIC MAPS; HAWKESWOOD RANGE; OARO RIVER

K-index values calculated from Amberley (AML) and Eyrewell Geomagnetic Observatory (EYR) data. The K-index is a measure of disturbances in the Earth’s magnetic field which was introduced by Bartels et al. (1939), that is recognised as a good indication of the strength of magnetic storm activity caused by the sun. It is based on the maximum fluctuations of horizontal components recorded in each 3-hour interval, so there are eight values each day. The scale is from 0 to 9, in an approximately logarithmic fashion, with the nT value required for the maximum value of 9 being a parameter of the observatory. Originally the fluctuations were measured on paper chart records, measuring short-term variations by subtracting the effects of the slower daily variations, but with digital records, algorithms are used to calculate only the effects of short-term variations. At Eyrewell, the manual method was used up until 1995, while from 1996 onwards, an algorithm developed by Hattingh et al (1989) at the Hermanus Magnetic Observatory was used (Tomlinson, 1995). The Hemanus algorithm is available from the website http://isgi.unistra.fr/softwares.php. Available data: Amberley (AML) 1951 – 1977 Eyrewell (EYR) 1978 – present 1932 – 1977 planetary Kp values (https://www.gfz-potsdam.de/en/kp-index/) were produced based on data from the Amberley observatory as a representative for the Southern Hemisphere. Toolangi only joined in 1972 (and was replaced by Canberra in 1981). DOI: https://doi.org/10.21420/PJ1Y-6M90 Cite as: GNS Science, & Hurst , T. (2021). EYR k-index values [Data set]. GNS Science. https://doi.org/10.21420/PJ1Y-6M90