This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 Excerpt: ...of the Maryville limestone has a mottled laminar appearance, which, especially when weathered, makes its recognition in the field comparatively easy. This peculiar aspect of the rock seems to be due to the alternate deposition of thin bands of material differing slightly in color and solubility. Upon weathering, the less soluble material stands out in thin, irregularly parallel ridges. In fresh exposures the difference in color gives the mottled aspect. The Middle Ordovician Lenoir limestone of the areas east of Clinch mountain resemble the Maryville so greatly that without fossils considerable difficulty in separating them would be experienced. The characteristic fossil of the Maryville limestone in Virginia is a branching fucoid one-fourth of an inch in diameter with a core one-half as thick. Some of the layers are crowded with these obscure organisms. The various beds making up the Maryville limestone are well shown in a section near Clinchport: Section of Maryville limestone along Virginia and Southwestern railroad, just south of Clinchport, Va. Thickness in feet. Nolichucky shale: Greenish or olive shales 550 Maryville limestone: (d) Shales and thin limestones interbedded 50 (c) Mottled laminar fine-grained limestones with a few massive granular layers 90 (b) Massive dark gray dolomite with a few dark cherty layers 50 (a) Fine-grained, mottled bluish limestone rather low in magnesia 300 Rogersville shale: Blue slightly calcareous shale Samples for analysis were selected from the rocks in the above section with the following results: Analyses of Maryville limestone, vicinity of Clinchport, Va. (J. H. Gibboney, Analyst.) Insoluble Alumina (Al, O, ) 7 Iron oxide (Fe,0, ) j Lime (CaO) Calcium carbonate (CaCO, ) Magnesia (MgO) Magnesium carbonate (MgCO, ). Per