The "Pancake Rocks," heavily eroded limestone outcroppings; Punakaiki, South Island, New Zealand. The rocks were formed by a chemical process called "stylobedding," which caused sediments to be laid down in alternate bands of durable and less-durable layers. Subsequent uplift and weathering has resulted in immense stacks of limestone, interspersed with "blowholes," which the waves burst through at high tide. The Pancake Rocks are a popular tourist destination, drawing thousands of visitors a year.