Cut back to the late 1970s – I was a schoolboy and had found my way into the Burnside Marl Pit, Dunedin (southern New Zealand) and up to the unit of greensand that is exposed on the hill side at the far end. Greensand is an accumulation of grains of the mineral glauconite. This green… Continue reading The Marshall Paraconformity – a 30 year geological debate in New Zealand