Box 25, Folder 6: Paleontology II

Lingula ampla, owen

Rep. Geol. Iowa + Wis p 583. pl 1 B, fig 5

Hall - Req. Rep 16 p. 125 pl 6 fig 10.

Potsdam Sandstone- Lowest fossiliferous beds.

St Croix valley. (Dells)

Mt Trempealeau

Lingula antigua Conrad

Hall. Geol. Wis 1 p 21 fig 2 & p.

See L. pinnoeformis

Lingulella aurora Hall

23d Rep p 244

Hall. Geol. Rep. Wis ^1860 p 2 1861 p 24

also Vol 1 p. 21 fig 4 & p 435

Req. Rep N.Y. 16 p 126 pl 6 fig 4 & 5. and p. 127 pl 6 fig 6-8

LINGULA AURORA, (n. s.)

Description. Shell of moderate size, broadly subovate; beak appressed, obtusely pointed; cardinal borders strongly diverging,

25

inclosing an angle of about 80o, and extending a little more than one-third the length of the shell; sides sub-parallel for a short distance; front rounded; valves very slightly convex. Surface marked by rather strong concentric lines of growth, and a few striae on partially exfoliated specimens.

This species varies from the last in being five or six times as large, measuring nearly three-fourths of an inch in length by a little more than half an inch in width. The form is distinct from every other species described from rocks of the same age.

Geological Formation and Locality. In rocks of the age of the Potsdam sandstone, Trempealeau, Wisconsin. James Hall.

Falls of the St Croix

Mezomania, near top of the Potsdam Sandstone

(No [true?] Lingula in Lower Rock Hall)

Lingula mosia Hall - Req Rep 16 p 126 pl 6 fig 1 & 2

Potsdam Sandstone

mezomania

Genus

Lingulepis Hall

Req Rep. 16 p. 129

Lingulepis pinnaformis, Owen Hall -