Editing Concretion (section)

===Cannonball concretions===
[[File:Bowling Balls Beach 2 edit.jpg|thumb|Concretions on [[Bowling Ball Beach]] (Mendocino County, California, United States) weathered out of steeply tilted Cenozoic mudstone]]
Cannonball concretions are large spherical concretions, which resemble cannonballs. These are found along the [[Cannonball River]] within Morton and Sioux Counties, [[North Dakota]], and can reach {{convert|3|m|ft|abbr=on|sp=us}} in diameter. They were created by early cementation of sand and silt by [[calcite]]. Similar cannonball concretions, which are as much as {{convert|4|to|6|m|ft|abbr=on|sp=us}} in diameter, are found associated with sandstone outcrops of the Frontier Formation in northeast [[Utah]] and central [[Wyoming]]. They formed by the early cementation of sand by calcite.<ref name=McBride/> Somewhat weathered and eroded giant cannonball concretions, as large as {{convert|6|m|ft|abbr=off|sp=us}} in diameter, occur in abundance at "[[Rock City, Kansas|Rock City]]" in [[Ottawa County, Kansas]]. Large and spherical boulders are also found along Koekohe beach near [[Moeraki]] on the east coast of the South Island of [[New Zealand]].<ref>Dann, C., and Peat, N. (1989) ''Dunedin, North and South Otago''. Wellington: GP Books. {{ISBN|0-477-01438-0}}</ref> The [[Moeraki Boulders]], [[Ward Beach#Ward Beach boulders|Ward Beach boulders]] and [[Koutu Boulders]] of New Zealand are examples of septarian concretions, which are also cannonball concretions. Large spherical rocks, which are found on the shore of [[Lake Huron]] near [[Kettle Point, Ontario]], and locally known as [[Kettle Point Formation|"kettles"]], are typical cannonball concretions. Cannonball concretions have also been reported from [[Van Mijenfjorden]], [[Spitsbergen]]; near [[Haines Junction]], [[Yukon Territory]], [[Canada]]; [[Jameson Land]], East [[Greenland]]; near Mecevici, Ozimici, and [[Zavidovici]] in Bosnia-Herzegovina; in Alaska in the [[Kenai Peninsula]] Captain Cook State Park on north of [[Cook Inlet]] beach<ref>{{cite web |url=http://cookinletconcretions.com/Kenai%20Article.htm |title=Kenai Peninsula Online – Alaska Newspaper – |access-date=2010-05-13 |url-status=dead |archive-url=https://web.archive.org/web/20110708191432/http://cookinletconcretions.com/Kenai%20Article.htm |archive-date=2011-07-08 }}</ref> and on [[Kodiak Island]] northeast of Fossil Beach.<ref>{{cite web|url=https://books.google.com/books?id=bGlonWEE-8YC&q=Fossil+beach+kodiak+concretions&pg=RA1-PA17|title=Geological Survey Professional Paper|date=24 May 1976|publisher=U.S. Government Printing Office|via=Google Books}}</ref> This type of concretion is also found in Romania, where they are known as ''trovants''.<ref>{{cite web |title=trovant |url=https://dexonline.ro/definitie/trovant |work=dexonline.ro |accessdate=October 3, 2024}}</ref><ref>Emma Davies, "[https://www.sciencefocus.com/planet-earth/trovants These ‘living’ rocks can give birth to baby stones]", 8 August 2023, ''[[BBC Science Focus]]''</ref>