412 A Geological Section at Todd's Fork^ 0. — Foerste. 
MOLLUSCA. 
MOLLUSCOIDEA. 
BRYOZOA. 
1857. Archimedes owenana Hall. Proc. Amer. Asso. Adv. Sci., vol. x. 
1858. Archimedes reversa Hall. Geol. Hep., Iowa. 
BRACHIOPODA. 
1861. Productus magnus Meek and Worthen. Proc. Acad. Nat. Sci.,, 
Phil., p. 143; also Geol. Rep. 111., vol. iii, p. 528, pi. 20, fig. 7 a. b. c. 
1809. Productus punctatus Martin. Petrif. Derb. 
(?) Productus-semi-recticulatus Martin. Ind. Geol. Rep. 1880, p. 125^ 
fig. 123. 
(?) Productus cora d'Orbigny. Voyage dans I'Amerique dele Meri- 
dionale. Ind. Geol. Rep., 1883, p. 125, pi. 28, fig. 1, 2, 3. 
1870. Spirifer fastigatus Meek and Worthen. Proc. Acad. Nat. Sci.,,. 
Phil., p. 36, also 111. Geol. Rep. vol. vi, p. 521, pi. 30, fig. 3. 
1858. Spirifer keokulc Hall. (Jeol. Rep. Iowa, vol. x. 
1809. Terrebratula sacculus Martin. Petrif. Derb. 
LAMELLIBRANCHIATA. 
1866. Aviculopten indianmnsis Meek and Worthen. Proc. Chi. Acad. Sci.,,. 
vol. i, p. 14; also 111. Geol. Rep., vol. iii, p. 532, pi, 19, fig. 6, a. b. 
1865. Lithopliagaf lingualis Meek and Worthen. Proc. Acad. Nat. Sci., 
Phil., p. 245; 111. Geol. Rep., p. 536, pi. 19, fig. 1, %. 
GASTEROPODA. 
1860. Platyceras eqwilatera Hall. Supplementary sheet to vol. i, pt. 2, 
Iowa Rep., p. 1 ; also 111. Geol. Rep., vol. v, p. 518 ; also Ind, Geol. Rep., 
1880, p. 514, pi. 17, fig. 2. 
PTEROPODA. 
1865. Conularia sub-carbonaria Meek and Worthen. Proc. Acad. Nat.. 
Sci., Phila., p. 353; also 111. Geol. Rep., vol. v, p. 520, pi. 19, fig. 4. 
1859-60. Conularia crawfordsvillensis R. Owen. Ind. Geol. Rep., 1859-60,. 
p. 364, fig. 9. 
ARTICULATA. 
1870. Phillipsia (Gr/ffithides) bv/o Meek and Worthen. Proc. Acad. Nat. 
Sci., Phila., p. 52; also 111. Geol. Rep., vol. vi, p. 528; also Ind. Geol.. 
Rep., 1880, p. 515, pi. 4, fig. 5. 
NOTES ON A GEOLOGICAL SECTION AT TODD'S FORK^ 
OHIO. 
By Aug. F. Foekste. 
Todd's fork is a small tributary of the Little Miami river. 
North of Wilmington, Ohio, on the road to Xenia, a bridge' 
crosses the stream. At the water's edge, a little streak of blue 
clay can be seen. This is said to be the top of a layer of blue- 
