- Stone balls
The terms Stone balls, "stone ball", "stone spheres", and "stone sphere" have been used to designate spherical stone objects of both natural and artificial origin. Different types of stone balls include:
Natural
*Natural Stone Balls
**megaspherulites
**cannonball concretions
**Moqui marbles
**spherical corestones created byspheroidal weathering Artificial
*Artificial Stone Balls (
Petrosphere s)
**lapidary spheres
**stone round shot (cannonballs)
**spherical stone shot fortrebuchet s
**Stone spheres of Costa Rica
**Carved Stone Balls ofScotland External links
tone round shot (cannonballs)
*
Ammunition column *Ruffell, W.L., 1996, [http://riv.co.nz/rnza/hist/gun/smooth4.htm The Gun - Smoothbore Era 1550-1860: Projectiles] Royal New Zealand Artillery Old Comrades' Association, New Zealand.
tone balls (spheres) of Costa Rica
*Hoopes, J.W., 2005, [http://web.ku.edu/~hoopes/balls/ The Stone Balls of Costa Rica] University of Kansas, Lawrence, Kansas.
Carved stone balls of Scotland
*Hunterian Museum and Art Gallery, nd, [http://www.hunterian.gla.ac.uk/collections/museum/online_exhibitions/stones/objects/objects.shtml Carved Stone Balls] A gallery of carved stone ball photographs & information
*Marischal Virtual Museum, nd, [http://www.abdn.ac.uk/virtualmuseum/index.php?page=topic&topic=ball,..carved..stone&case=n06&first=7&last=18&roomlocation=ng ball, carved stone] Aberdeen Museum's virtual gallery of their Carved Stone ballsMegaspherulites
* Baird, Bill, 1990, [http://www.edinburghgeolsoc.org/edingeologist/z_24_04.html "Stone Spheres"] , The Edinburgh Geologist, no 24 (Spring)
*Heinrich, P.V., 2007, [http://www.hgms.org/BBG/Jul07.pdf Megaspherulites." PDF version, 1.4 MB] BackBender's Gazette. vol. 38, no. 7, pp. 8-12.
* Rodríguez, E.A., 2002, [http://web.archive.org/web/20030707135338/http://www.mexicodesconocido.com.mx/english/naturaleza/bellezas_naturales/detalle.cfm?idsec=6&idsub=0&idpag=1681 "The fantastic balls in el Cerro Piedras Bola (Jalisco)"] , México desconocido # 305, July 2002. Last visited February 11, 2008.
* Smith, R.K., R.L. Tremallo, and G.E. Lofgren, 2000, "Megaspherulite Growth: Far From Equilibrium Crystallization", GeoCanada 2000 - The Millennium Geoscience Summit, Canadian Society of Exploration Geophysicists Annual Meeting.
*Smith, R.K., R.L. Tremallo, and G.E. Lofgren, 2001, [http://ammin.geoscienceworld.org/cgi/content/abstract/86/5-6/589 "Growth of megaspherulites in a rhyolitic vitrophyre"] , American Mineralogist. vol. 86, pp. 589–600.
Cannonball Concretions
* Hanson, W.D., and J.M. Howard, 2005, [http://www.state.ar.us/agc/mp22.pdf "Spherical Boulders in North-Central Arkansas" PDF version, 2.8 MB] Arkansas Geological Commission Miscellaneous Publication n. 22, pp. 1-23.
*Heinrich, P.V., 2007, [http://www.hgms.org/BBG/Aug07.pdf "The Giant Concretions of Rock City Kansas" PDF version, 836 KB] BackBender's Gazette. vol. 38, no. 8, pp. 6-12.
* Irna, 2006, [http://irna.lautre.net/Tout-ce-que-la-nature-ne-peut-pas,45.html All that nature can never do, part IV : stone spheres]
* Irna, 2007a, [http://irna.lautre.net/Stone-balls-in-France-too.html Stone balls : in France too!]
* Irna, 2007b, [http://irna.lautre.net/Boules-de-pierre-en-Slovaquie.html Stone balls in Slovakia, Czech Republic and Poland]
* Hokianga Tourism Association, nd, [http://www.hokiangatourism.org.nz/activities/koutuboulders.htm "Koutu boulders"] Really nice pictures of cannonball concretions.
*Moeraki Boulders
*Rock City, Kansas
* United States Geological Survey, nd, [http://nd.water.usgs.gov/lewisandclark/points/concretions.html "cannonball concretion"]
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