Oamaru Limestone dikes
Known as 'one of the best examples of limestone dikes in New Zealand'.
This well weathered outcrop consists of tuff (formed from volcanic ash) - associated with volcanism that was active from around 38 million years in the Oamaru area. This outcrop shows some weakly bedding planes in places, but in the main is massive. Of significance are two jointed limestone dikes of the Ototara Limestone (Oamaru Stone) that run near vertically through the tuff. Typically dikes are igneous in origin and intrude existing rock. The dikes exposed here at Chelmer Street are in fact the reverse of this - where a sedimentary unit is seen to intrude igneous material.
Please be aware the following hazards include: Falling debris (rock and plants) from overhead and traffic.
You can park in the Oamaru Public Gardens carpark on Chelmer Street. The road cutting is just across the road.
Protection and guardianship are at the heart of the Geopark philosophy. We ask you to treat this site with respect, do not remove anything from this site and preserve it for our future generations.