“Learn About It” section, Howells Point Volcanics GeoTrip, Riverton Aparima. http://www.geotrips.org.nz/trip.html?id=331
2 GeoTrips Howells Point 3
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A Blog About Stone Gathering, Tumbling and Polishing, and Rocks and Landscapes, from New Zealand – With Musical Interludes (john.tumblestone@gmail.com)