395 
THE PALEOBOTANY OF THE BLOOMINGTON, INDIANA, 
QUADRANGLE. 
T. KF. JACKSON. 
The fossil plants herein discussed are, with three exceptions, Penn- 
sylvania forms and were collected principally from two localtiies in the 
Bloomington, Indiana, Quadrangle. The greater part of them were ob- 
tained from a shale bed about one-fourth mile southeast of the Yoho 
School. This bed was made up of a succession of thin, bluish-gray clay- 
shales interstratified with thin sandy layers, with nodules of iron ore 
irregularly distributed throughout the entire bed. The shale layers were 
very soft and plastic when wet and both the shale layers and sandy layers 
were rather hard and very brittle when dry. One of the shale layers 
was very highly impregnated with iron oxides, and from this layer the 
best fossils were obtained. The entire bed attains a thickness of eight 
to nine feet. 
The remainder of the Pennsylvanian forms were obtained from a thin, 
ferrugineous sandstone layer and an overlying sandstone layer, about 
one-fourth mile southeast of Cincinnati. Molds and casts of Lepidodendron 
and Calamite forms were collected from the latter. The ferrugineous 
sandstone layer contained a number of Trigonocarpon and a few Carpo- 
lithes forms. 
Loose sandstone fragments of fossil plants, apparently of Pennsyl- 
vanian age, were hoted in a number of places in the southwestern part 
of the Quadrangle, but, as their exact horizon could not be ascertained, 
those forms are not included in the following lists of species. 
A few fragments of Mississippian forms were noted in the central 
and northern part of the west half of the Quadrangle. Those plants were 
yery poorly preserved and at but one place were fossils obtained in a 
state of preservation such that identification was possible. Three species 
in a fair state of preservation were found in a sandstone layer a few feet 
above the Mitchell limestone, about one-half mile west of Whitehall. 
