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Oaia pillow-lava islet, Maori Bay - Q11

Oakley Creek and waterfall - R11

Oakura Beach debris avalanche deposit - P19

Oamaru Court House - J41

Oamaru limestone dikes - J41

Oamaru pillow lavas and volcaniclastic rocks - J41

Oaonui dune fields - P20

Ocean Beach autochthon-allochthon contact - R07

Ocean Beach basal Waitemata Group sediments, Motuihe Island - R11

Ocean Beach dune fields, southern Hawkes Bay - W21

Ohaaki Pool hydrothermal sinter - U17

Ohaka Head dike swarm - Q11

Ohakune craters - S20

Ohakune Lakes maar craters - S20

Ohakune scoria cone - S20

Ohakune scoria cone hematite - S20

Ohakune tuff ring - S20

Ohakuri Ignimbrite section - U16

Ohana Bay prehistoric quarry - P26

Ohara Depression deformed Pliocene fossils - U21

Ohariu Fault, Muaupoko Valley - R26

Ohariu Fault, Ohariu Valley Road - R27

Ohariu Fault (previously Kakaho Fault), Kakaho Valley, Pauatahanui - R26

Ohawe Beach Quaternary terraces - Q21

Ohia black shale - O04

Ohika hydrothermal metamorphism - K29

Ohinau Island columnar rhyolite - T10

Ohinemaka Beach cuspate foreshore, South Westland - G36

Ohinemuri-Waikino Gorge section - T13

Ohinemutu-Kuirau geothermal area - U16

Ohinetahi Homestead, Governors Bay - M36

Ohinewai Hot Springs - S13

Ohingaiti cut-off meander - T22

Ohira Bay columnar jointed basalt - CH

Ohiwa Harbour Pleistocene fossils - W15

Ohiwa Harbour remnant barrier spit - W15

Ohope barrier spit and dune ridges - W15

Ohope Beach Pleistocene marine sediments and Ohope shell bed - W15

Ohuka Plio-Pleistocene flora and carbonaceous sandstone - R13

Okahu Bay bayhead fill - R11

Okahu Point shore platform, Te Kaha - X15

Okaihau basalt plateau - P05

Okana River delta - N36

Okareka Tephra section - U16

Okarito Lagoon - H34

Okataina Springs - V16

Okauia Hot Springs - T14

Okawa debris avalanche mound field - Q19

Okere Falls hydro-electricity station and gorge - U15

Okete Quarry jointed basanite flow section - R14

Okiwa Bay Pelorus Schist - P27

Okoroire Hot Springs - T15

Okuku Triassic Monotis locality - M34

Okupata Caves, Tongariro Forest - S19

Okupe Lagoon uplifted lagoon, Kapiti Island - R26

Okura River estuary shell spit - R10

Okuru River faulted terraces (Alpine Fault) - F37

Okuru River mouth coastal features - F37

Old Chemistry building, Christchurch Arts Centre - M35

Old Man and Obelisk Range summit tors and sheath folds - G42

Old Man and Old Woman Rocks, Huriawa Peninsula, Karitane, Otago - I43

Old Man Range peneplain - G42

Old Parliament buildings and foyer - R27

Old Rifle Butts Eocene-Miocene sequence - J41

Old Waiotapu Road section - U16

Old Woman Range patterned ground and solifluction stripes - F42

Old Woman Rock, Hen Island - R08

Omanuka dune-dammed lake - S24

Omarama badlands (Clay Cliffs) - H39

Omara spit - T10

Omaui Island polished cliffs, Bluff - E47

Omokoroa Pt peat-ignimbrite section - U14

Onaero coastal features - Q19

Onaero Domain tephra section - Q19

Onamalutu Valley metachert - O28

Onawe Peninsula, Akaroa Harbour - N36

Onawe Peninsula volcanic deposits - N36

Onehunga springs (Bycroft Reserve) - R11

O'Neill Bay crater - Q11

Onekaka Iron Works complex - M25

Onemama Point allochthonous sediments, Whangarei Harbour - Q07

Onepoto explosion crater - R11

Onepoto volcanic cone - R12

Onepu lava domes - V15

Onepunga Miocene bryozoan locality - M34

Onerahi overturned syncline - Q07

Oneriri Road hyaloclastic tuff, Kaiwaka - Q08

Oneroa Beach Miocene fossils - R11

One Tree Hill scoria cone - R11

One Tree Point interglacial beach and dune deposits - Q07

One Tree Point relict dunes and beach ridges, Bream Bay - Q07

Onewhero scoria cone - R13

Onewhero tuff ring - R13

Ongahoro/Round Hill lava domes - U16

Ongaroto Hot springs - T17

Ongaroto perlite - T17

Ongarue rail disaster site - S18

Ongohi Stream delta, northwest Coromandel - S10

Onoke scoria cone and ballast pit - Q06

Oparara natural bridge (Oparara Arch) - L27

Oparara Quarry granite - L27

Open Bay Islands, South Westland - F37

Ophir Post Office - G41

Opihi Lagoon and Harakeke Tautoro Island - K38

Opihi taniwha rock drawing - J38

Opito Point basalts - T10

Opononi limestone, Hokianga - O06

Opotiki Cliffs Pleistocene tephras - W15

Opoutama mud volcano and gas seep - X19

Opoutama salt water and gas seep - X19

Opoutere Beach, Coromandel Peninsula - T12

Opuatia cliff Jurassic fossils - R13

Opunake Cliffs lahar sequence - P20

Oraka Point intrusions - D46

Orakei Basin tuff ring - R11

Orakei Greensand Miocene fossils - R11

Orakeikorako, Artist's Palette - U17

Orakeikorako, Diamond Geyser - U17

Orakeikorako Geothermal Field - U17

Orakeikorako, Golden Fleece Terrace - U17

Orakeikorako, Rainbow Terrace - U17

Orakeikorako, Ruatapu cave - U17

Orakonui Ignimbrite section - U17

Orari River mouth oxbow lagoons - K38

Orepuki oil shale pit - D46

Oreti River (east) Triassic fossils - E44

Ormond Pleistocene plant beds - Y17

Orongorongo River uplifted marine terraces - R28

Oroua Valley Triassic fossils - T22

Orowaiti raised terraces - K29

Orua Hot Springs (Hot Water Beach) - T11

Oruanui Ignimbrite section A - U19

Oruanui Ignimbrite section B - U19

Oruawharo hyaloclastite - Q09

Ostler Fault, Ohau River faulted terraces - H38

Ostler Fault zone, Ben Ohau Range foothills - H38

Ostler Fault zone, 'The Knot' - H39

Ostler Fault zone, Willowbank Saddle - H39

O'Sullivans granite - L29

Otago Peninsula pyramids - J44

Otago University clocktower building - I44

Otaihanga Oligocene sedimentary outlier - R26

Otahuhu Creek islet - R11

Otaika Valley karstic basalt, Whangarei - Q07

Otaio River Paleogene fossiliferous sediments - J39

Otaki beach ridges - R25

Otaki Fault, Mangahao Valley - S25

Otaki Forks Triassic Monotis fossils - S26

Otama relict dunes - T10

Otamita Stream Triassic fossils and stratotype - F45

Otamita Valley Rd sequence - F45

Otangaroa Caves, Mangamuka - O04

Otapiri Stream Triassic stratotype - E45

Otau cone - S12

Otehake River Springs - K33

Otira River Springs - K33

Otuataua lava flows - R11

Otueka Hill Miocene fossiliferous sequence - O05

Oturere lava flow, Mt Tongariro - T19

Ouaha gullies and rills - U18

Oweka Creek Pliocene macrofossils, Cape Runaway - Y14

Oweka rock block slide - L29

Owenga pillow lava and wave-cut platform, Chatham Island - CH

Owen Ice Cavern - M28

Owhaoko Plateau - U20

Owharoa Falls owharoaite, Karangahake Gorge - T13

Oxford Oligocene Chalk Quarry - L35