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is used to describe a sediment or sedimentary rock composed of scattered to loosely packed nodules in matrix of like or unlike character. It is also used to describe mineral aggregates that occur in the form of nodules, e.g. colloform mineral aggregate with a bulbed surface.
165:. Manganese and phosphorite nodules form on the seafloor and are syndepositional in origin. Thus, technically speaking, they are concretions instead of nodules.
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and sometimes these terms are used interchangeably. Minerals that typically form nodules include
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and the postdepositional replacement of either the enclosing limestone or chalk by this silica.
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Small mass of a mineral with a contrasting composition to the enclosing sediment or rock
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is also used for widely scattered concretionary lumps of manganese,
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Cambridge
University Press, Cambridge, United Kingdom. 600 pp.
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is a small, irregularly rounded knot, mass, or lump of a
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nodular limestone at
Jinshitan Coastal National Geopark,
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that typically has a contrasting composition, such as a
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172:nodules are often found in beds of limestone and
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19:For metallic concretions on the seafloor, see
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176:. They form from the redeposition of
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116:. Nodules are closely related to
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161:. This is especially true of
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30:Devonian nodular limestone
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366:Sedimentary rocks
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221:References
196:radiolaria
168:Chert and
89:nodule in
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361:Petrology
185:siliceous
178:amorphous
130:anhydrite
124:, chert,
83:limestone
67:aggregate
351:Minerals
202:See also
188:spicules
98:sediment
192:sponges
136:Nodular
126:apatite
122:calcite
114:fossils
110:bedding
85:, or a
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45:, China
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181:silica
159:oceans
155:nickel
153:, and
147:cobalt
143:Nodule
106:strata
91:marine
71:pyrite
59:nodule
43:Dalian
296:This
214:Flint
208:Chert
174:chalk
170:flint
94:shale
79:chert
302:stub
269:ISBN
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151:iron
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