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Puddingstone (rock)
Puddingstone, also known as either pudding stone or plum-pudding stone, is a popular name applied to a conglomerate that consists of distinctly rounded pebbles whose colors contrast sharply with the color of the finer-grained, often sandy, matrix or cement surrounding them. The rounded pebbles and the sharp contrast in color gives this type of conglomerate the appearance of a raisin or Christmas pudding.〔Neuendorf, K.E.K., J.P. Mehl, Jr., and J.A. Jackson (2005) ''Glossary of Geology.'' Springer-Verlag, New York, 779 pp., ISBN 3-540-27951-2〕〔The McGraw-Hill Companies (2003) ''McGraw-Hill dictionary of geology and mineralogy'', 2nd ed. The McGraw-Hill Companies, Inc, New York, 420 pp., ISBN 0-07-141044-9〕 There are different types of puddingstone, with different composition, origin, and geographical distribution. Examples of different types of puddingstones include the Hertfordshire, Schunemunk, Roxbury, and St. Joseph Island (Drummond Island), puddingstones.
==Hertfordshire puddingstone==
Hertfordshire puddingstone is a silica-cemented conglomerate composed of rounded flint pebbles and cobbles with matrix of fine sand and silica cement. The Hertfordshire Puddingstone is characterize by silica-cemented flint gravel that is brown to deep red in color and often exhibit black exteriors and thin rinds on cut or polished surfaces. It typically occurs scattered across the land surface as isolated concretion-like masses in the area of Hertfordshire and Plumstead Common, England. Large masses of Hertfordshire Puddingstone often occur within local Pleistocene glacial tills. More than a dozen large blocks of this puddingstone were recovered from Paleogene sediments during recent construction of the A10 bypass from Thundridge to Puckeridge. This indicates that the loose blocks of Hertfordshire Puddingstone were likely eroded out of these sediments. Although it is hypothesized that it is groundwater silcrete, its origin remains unresolved.〔Lovell, B., and J. Tubb (2006) (''Ancient Quarrying of Rare in situ Palaeogene Hertfordshire Puddingstone.'' ) Mercian Geologist. 16(3):185-189.〕〔Perkins, S. (2005) (''Hertfordshire Puddingstone.'' ) (East Herts Rock Club ), Ware, England.〕
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