. Australasian fossils, a students' manual of palaeontology. Paleontology. F0SSIL1FER0US ROCKS. 69. Fag. 41,— Fossiliferous Mudstone of Silurian (Yeringian) Age. With Brachiopods. About 2/z nat. size. Near L,ilydale, Victoria. ( Coll.) FOSSILIFEROUS ROCKS. Section I.—ARGILLACEOUS ROCKS. Under this head are placed the muds, clays, mud- stones, shales and slates. MUDS are usually of a silty nature, that is, containing a variable propor- tion of sand (quartz) grains. Such are the estuarine muds of Pleistocene and Recent age, containing brack- ish water foraminifera and ostracoda, and those sh
. Australasian fossils, a students' manual of palaeontology. Paleontology. F0SSIL1FER0US ROCKS. 69. Fag. 41,— Fossiliferous Mudstone of Silurian (Yeringian) Age. With Brachiopods. About 2/z nat. size. Near L,ilydale, Victoria. ( Coll.) FOSSILIFEROUS ROCKS. Section I.—ARGILLACEOUS ROCKS. Under this head are placed the muds, clays, mud- stones, shales and slates. MUDS are usually of a silty nature, that is, containing a variable propor- tion of sand (quartz) grains. Such are the estuarine muds of Pleistocene and Recent age, containing brack- ish water foraminifera and ostracoda, and those shells of the mollusca usually found associated with brackish conditions. Lacustrine mud can be distinguished by the included freshwater shells, as Limnaea, Coxiella (brackish), Cyclas and Bulinus, as well as the fresh- water ostracoda or cyprids (Fig. 40). CLAYS are tenacious mud deposits, having the general composition of a hydrous silicate of alumina with some iron. When a clay deposit tends to split into leaves or laminae, either through moderate pres- sure or by the included fossil remains occupying dis- tinct planes in the rock, they are called SHALES. 69. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chapman, Frank M. (Frank Michler), 1864-1945. Melbourne, London [etc. ] G. Robertson & Company Propy. ltd.
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