Kaloko-Homokohau National Park
A mixture of dark and white sand grains present a colorful view of the diverse sand at Kaloko-Honokohau beach. Dark red and black porphyritic volcanic grains and varied colored sea urchin spine fragments...
A mixture of dark and white sand grains present a colorful view of the diverse sand at Kaloko-Honokohau beach. Dark red and black porphyritic volcanic grains and varied colored sea urchin spine fragments...
A variety of organic sand grains including red foraminifera (forams), a clear triangular sponge spicule in the center, short rods of calcareous algae, and bits and pieces of coral...
Only 9 miles long and 2 miles wide, St. John boasts of lush emerald mountains, hills and valleys without many flat areas, and soft white coral sands on numerous near-deserted tranquil beaches...
Although St. John is a volcanic island and part of a submarine mountain range extending from Cuba to Trinidad, sand on recreational beaches is primarily biogenic. This beach sand...
A sand mixture of calcified algae, coral fragments, bits of mollusk shells, and pale and red forams reflects the diversity of adjacent sea life surrounding this island. Most of these sand grains...
This mixture of white and tan sand grains includes grooved fragments of mollusks and fragments of calcareous algae and smoothly worn forams. The red grains are fragments of the foraminifera...
This large mixture of sand grains is essentially of biogenic origin representing bleached coralline algae and fragments of coral with the exception of a larger dark grain of volcanic origin...
Among the larger sand grains are light tan and brown mollusk shell fragments. The black grain with thin vertical white stripes just below center is also a mollusk shell fragment while the smaller...
Sand Beach is comprised of fine-grained sand while other Maine beaches that are open to waves and storms consist of pebbles, cobbles and boulders. In contrast to the mixed marine and geological...
The west coast of Newfoundland with its 550-million-year-old volcanic and sedimentary rock is home to some of the oldest rocks in the world. This area is a visible example of the obduction process...