page_title: Puddingstone (rock)
section_title: Roxbury puddingstone
hierarchical_section_title: Puddingstone (rock) / Roxbury puddingstone
context_page_description: 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. 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 puddingstones.
context_section_description: The Roxbury puddingstone is a massive, Ediacaran, clast-supported pebble and cobble conglomerate that occurs within the Brookline Member of the Roxbury Conglomerate that is exposed around Boston, Massachusetts region. This conglomerate is composed of a grey feldspathic sand matrix and well-rounded pebbles and cobbles of quartzite, granite, felsite, and quartz monzonite. The beds of ‘puddingstone’ are complexly interbedded with layers of massive diamictite  and laminated and graded argillite and sandstone. It likely accumulated as turbidites and submarine slumps within a submarine fan or outer slope environment within a deep rift basin submerged by marine waters.
caption: Roxbury puddingstone
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