Caliche Forest

Expect chalky, brittle spires, logs, and root forms emerging from sandy slopes—striking against the wind-scoured terrain. Some casts are impressively large; one notable caliche log measures roughly 2.5 feet across and about 30 feet long. The setting is open and windswept, with big island views and very little vegetation right at the site.

During colder, wetter periods in the past, vegetation (possibly including pines and cypresses) grew here. Blowing sand buried the plants; as they decayed, calcium carbonate—mobilized by rainwater from shell-rich sands—cemented the surrounding material into hard caliche. Over time, erosion peeled back the dunes and exposed these stone-like molds and casts. Similar exposures occur in several areas on the island.

The feature itself is stark and doesn’t host much life, but along the way and on nearby beaches you may encounter seabirds and, seasonally, marine mammals. Most wildlife sightings happen on the approach hikes and along the coast rather than among the caliche casts.

These formations are fragile and irreplaceable. Stay with your ranger, follow instructions, and avoid touching or stepping near the casts. Pack out everything you bring.