Ice contains many different states of formation within these categories. Young ice exists in many forms. It can be thin and covering the surface like an oil sheet, or thicker and slushy, as in the case of Nilas and pancake ice. Frazil ice is often deceptive, because it gives the ocean a slick, oily feel. In several cases it has been mistaken for an oil spill.
Nilas ice is a very interesting form of new ice.
It is a thin crust of ice that moves with waves. Pancake ice is a harder form of Nilas ice. Pancakes of ice form when slush or Nila ice congeals into larger cakes on the surface of the water. When these cakes crash into each other, pieces of ice get stuck to other pieces, and the cakes grow larger. This form of ice is sometimes rather dangerous to ships, because of the size this ice can attain.