Box 25, Folder 6: Paleontology II

Lingulepis pinnaeformis owen - Hall

Req. Rep. 16 p 129 pl 6 fig 14 + 16

Lingula pinnaeformis Owen

Geol. Rep. Iow + Wis p 583.^pl. 1 B fig- Hall, Geol. Wis 1 p 21 fig 3 + p. 435

(usually referred to L. antiqua)

Potsdam Sandstone

common at Falls of the St Croix

Lingula quadrata, Hall Eichwald,

Hall - Pal. N. Y. Vol. 1, p. 96. pl. 30 fig 4 + p 285 pl 79 fig 1. - Hall. Wis Geol. Rep 1 p 46 fig 1 & p. 435- Ill. Geol Rep 3 p 305 pl 2 fig 4, a, b, c.

Equivalve, equilateral, broadly oval, depressed = convex ; sides nearly straight and parallel, or slightly curved; extremities nearly equal in width, the first broadly rounded; cardinal extremity slightly narrowed and somewhat angularly sloped; beaks marginal, not prominent; exterior surface of the shell marked by strong concentric striae, and along the middle by distinct longitudinal striae, which are equally visible when the outer shell is exfoliated; a longitudinally depressed line marks the shell from the beak nearly half way to the base.

L. 0.75 to 1.0 - H. 1.1 to 1.5- D 0.3

Lower Silurian - Trenton Limestone & Hudson River Group

Trenton Falls, Middleville, Turin, & Loraine Lowville, N. York. Ohio -

Wisconsin.

Penna.

Warren &c, Jo Davis Co. Ill.

Sec 23 - T. 1 R 2 E - Near Shullsburg in upper loose beds of Galena limestone

(Also in Russia Europe)

Lingula riciniformis, Hall,

Pal. N.Y. Vol. 1 p. 95 pl. 30 fig. 2

Oval, convex, slightly attenuated towards the beak, which is obtuse; surface nearly smooth, or with fine nearly obsolete concentric lines ; fine radiating striae are sometimes visible; surface sometimes slightly ridged, as if from elevated lines beneath the outer lamina of the shell. Distinguished by its oval form + equal convexity.

L. 2.2 H. 3.2

Lower Silurian - Trenton Limestone

Middleville, Herkimer Co. N.Y. in compact dark limestone.