concretions

Concretions Type of Rock: SEDIMENTARY
RocksForKids.com

Concretions are rounded rocks embedded in layers of stone in sedimentary rocks. They are often harder than the surrounding rock and weather out of the host rock. They are often spherical or nodules. Nodules are often shaped like potatoes. Some concretions have unique appearances and are given special names. Some are: cannon balls septarian nodules turtle stones thunder eggs fairy stone
Concretions
SPECIMEN ORIGIN: Eden, New York, USA	SPECIMEN ORIGIN: Rockwood, Michigan, USA
SPECIMEN ORIGIN: Yukon Territory, CANADA
Cannon Balls
SPECIMEN LOCATION: Kettle Point, Ontario CANADA	Cannon Balls - Kettle Point, Ontario, CANADA This photo was taken at the Indian Reservation at Kettle Point, Ontario. The shale at the edge of Lake Huron is cracking and eroding away from the cannonball. The Point was named because the cannonballs appear like upside down cooking kettles coming through the shale. Many of the local people have dug up cannonballs from the lake and displayed them as ornaments on the front lawns of their homes.
Cannon Balls - NEW ZEALAND & AUSTRALIA
Photos & description courtesy B. Daniels May 2003

Photos were taken in Central Australia, north of Alice Springs. Photos show the seashore in southeast New Zealand (South Island). Many cannonballs are emerging and rolling into the sea from the low bluffs to the left of the picture. Note that not all concretions are cannonball shaped. For more photos of cannon ball concretions, check out the following sites: Theodore Roosevelt National Park, The North Dakota Badlands, North Dakota, USA Concretions, Bombs, and Ground Water Concretions and Nodules in North Dakota
Septarian Nodules Septarian nodules are common decorative stones that have been used making objects like bookends, clock faces, spheres, eggs or carvings. In North America, the most recognized septarian nodules come from Utah.

Turtle Stones Turtle stones are septarian nodules that look like the backs of turtles. The concretions are more oval in shape - like a turtle, rather than spherical - like a ball. The yellow calcite has "oozed out" between the grey rock material and looks like the markings on the back of a box turtle.
	SPECIMEN LOCATION: Eden, New York, USA




Thunder Eggs
Thunder Egg - whole and cut in half Brushy Canyon, Chiricahuas Mts., Cochise County, Arizona USA	Thunder Egg - whole and cut in half Jefferson County, Oregon USA
Septarian Nodule with Calcite from MOROCCO
Fairy Stone Calcium Carbonate Concretion from Abitibi, Quebec, Canada

Concretions Type of Rock: SEDIMENTARY RocksForKids.com

Concretions

Cannon Balls

Septarian Nodules

Turtle Stones

Thunder Eggs

Concretions Type of Rock: SEDIMENTARY
RocksForKids.com