“No. 1621. LATH NIAGARAN STRATA—PATE AND BASSLER. 419 
White and gray shaly limestones and shales which rapidly disin- me 
tegrate into a white clay upon exposure. Coccocrinus bacca 
found throughout this division but most abundant near the 
SNUG 8 DS ae Sa ee ae egy ee RON 19 
Gray, Shaly, rather unfossiliferous limestones___________-_______ 5 
Hard white limestone with a purplish tinge upon fresh fracture_ iL 
White or greenish-white clay containing numerous dwarfed 
specimens of Bilobites, Plectambonites, Pisocrinus, ete________- 2 
Dixon formation. Red and purple shales and shaly limestone __________ — 
Astreospongia meniscus is a very abundant and characteristic 
fossil of the Beech River, although not restricted to this formation. 
Specimens of this sponge in the later divisions of the Niagaran are 
rare. Spirifer oligoptychus, Orthis ? fissiplica, Dalmanella arcuaria, 
Fistulipora hemispherica, Fenestella acuticosta, Astylomanon cratera 
and varieties, Caryomanon inciso-lobatum and C. stellatim-sulcatum, 
are likewise abundant and range throughout the three beds. 
The three subdivisions of the Beech River formation are, as a rule, 
quite similar lithologically and they are instituted mainly because of 
faunal differences. Mr. Springer’s work upon the Crinoidea will 
illustrate this portion of the fauna in detail. The most abundant 
erinoid fauna has been found in the upper or Eucalyptocrinus zone, 
where Mr. Pate collected Callicrinus ramifer, Lampterocrinus tennes- 
seensis, L., new species; Lucalyptocrinus milliganae, E. ventricosus, 
Allocrinus typus, and three or four new species; J/arsupiocrinus 
tennesseensis, M. striatus, Lecanocrinus pisiformis, Herpetocrinus 
gorbyi, Calceocrinus, two new species; Pesocrinus milliganae, P. 
gemmiformis, Thalamocrinus ovatus, T. cylindricus, Thysanocrinus 
milliganae, Sagenocrinus, new species, as well as other undescribed 
forms. 
BOB FORMATION. 
Just below Bob Landing, along the west bank, the Tennessee River 
has exposed a section of red limestone and shales so similar in lith- 
ology to the Dixon formation that at first sight one would not hesitate 
to so refer them. A closer investigation of these strata shows that 
they overlie the Eucalyptocrinus zone of the Beech River formation, 
with its numerous characteristic fossils, and are succeeded by the 
brachiopod beds described below as the Dictyonella zone. Red strata 
holding the same position can be traced through the southern part 
of Decatur County and through Hardin and Wayne counties as far 
south as Indian Creek, so that these red rocks are known to occupy 
at least this limited area. These strata vary in thickness from 5 or 6 
feet in their southern outcrop along Indian Creek at a bridge about 
half way between Olive Hill and the mouth of the creek to 20 feet 
or more at Bob. Large examples of Uncinulus stricklandi are quite 
common in this division, so, for convenience of reference, these strata 
may be called the Uncinulus bed or zone. 
