Napenape

The white cliffs at Napenape are made of fine-grained Amuri Limestone (colloquially also known as chalk) and contain the tiny fossils of calcitic marine plant and animal plankton (coccoliths and foraminifera). These rocks also contain many trace fossils, the most obvious of which is the unusual corkscrew shaped Zoophycos. Zoophycos is thought to be formed by moving and feeding marine polychaete worms and can extend for up to 1 m, both horizontally and vertically in the rock. Zoophycos are an important part of the bedding plane waviness at 0.5-1 m scale, and thought to probably contribute greatly to the engineering stability of the rock mass.
The controversial "Marshall Paraconformity" (see link) is also exposed at this location towards the top of the cliff at the southern end of the beach. It was in part formed because many small marine animals have burrowed into the top surface of the Amuri Limestone before the greensand (literally "green sandstone", from the Spy Glass Formation at the base of the Motunau Group - Oligocene aged) was laid down on top, now infilling those burrows and the formation of numerous phosphate nodules.

Napenape is a spectacular place at sunrise with the contrast of the stark white cliffs against the dark grey stones (mostly eroded Torlesse Supergroup) on the beach. The microscopic organisms that make up this fine stone feel smooth under your fingers as opposed to many coarser limestones made of broken or whole shells or fossils.
Can you see the bedding layers in the limestone in the large cliff at the south end of the beach sloping towards the east? This slope (called a dip) is due to the ongoing present day uplift of the North Canterbury ranges to the west.
Also note the "Marshall Paraconformity" where the darker greensand unit sits on top of the white chalk near the top of the cliff. If you look very carefully at this unconformity you'll see it is very knobbly and broken up in appearance due to the burrows. Right at the very top of the cliff you will also see much younger (Quaternary) brown gravels deposited in the marine environment and sitting on an erosion surface above the greensand.
The best rocks to view the Zoophycos trace fossils can be found directly at the red marker on the map. They are exposed in tilted rock slabs facing the ocean, at the back of the beach. Look for the spiral-like radiating scratch marks up to 1 m across embedded in the limestone surface!