276 
ing’ states that in New York during the early Stones River time deposi- 
tion was confined to the Champlainian trough, and following the retreat 
of that sea to the northwest into the St. Lawrence Gulf at the close of the 
Crown Point stage, the Gulf of Mexico Embayment came into central New 
York from the south, bringing in species and genera similar to the southern 
interior faunas. During the upper Pamelia time the gulf connections were 
restricted and somewhat later the sea was drained from the New York 
region and the Champlain trough became again the area of deposition dur- 
ing the upper Chazyan (Valcour stage). 
BRYOZOAN FAUNAS OF THE STONES RIVER GROUP’. 
The earliest known bryozoan, Heteronema priscum, is a ctenostomatous 
form and occurs in the Ungulite sandstone at Jegelecht Falls, Esthonia, 
Russia. In Sweden this standstone has been referred to the basal Ordo- 
vician by Swedish geologists from the presence of the fossil Obolus apollinis. 
The earliest American form is a species of Nicholsonella from the Beek- 
mantown of Arkansas. Following these occurrences in chronological sue- 
cession comes the earliest prolific fauna of the Stones River limestone in 
central Tennessee. Considerable work has been done on the bryozoan faunas 
of the early Mohawkian beds that occur in different places in North 
America but up to this time very little has been published. The description 
of several species collected from the Stones River of the Central Basin 
area in Tennessee and published in the “Final Report of the Geological and 
Natural History Survey of Minnesota,’ Volume 3, 1893, by IE. O. Ulrich, is 
the most important paleontological contribution. The published work on 
the bryozoan fauna in other localities has been of a general nature and in 
many cases the author only suggested that a considerable fauna of bryozoa 
was indicated by the numerous fragments of this class of fossils. In other 
cases collections containing abundance of bryozoa have been made and laid 
aside until more time was available to study them. The present report 
is the most extensive publication up to this time based upon new and de- 
scribed forms of the Stones River bryozoa. The full value of the work can- 
not be realized until the faunas of other areas have been studied in detail 
and some of the conclusions reached may be modified when the information 
from other areas is available. Considerable work has already been done 
by the writer upon the bryozoa from the Chazy of New York which will 
form the basis of a subsequent paper. 
Murfreesboro fauna. The bryozoa collected are few and poorly preserved 
and it is only the large trepostomatous species that can be identified from 
the exterior surface, which are included in the table showing the range 
and distribution of all the Stones River forms. The interior structure of all 
of the observed specimens is destroyed by silicification. No gtenostomata 
are reported from the Murfreesboro or later divisions of the Stones River. 
Pierce fauna. Bryozoa are very abundant in the Pierce limestone. The 
Order Cyclostomata is represented by five genera and nine species. All 
1Geol. Soe. of Amer. (1901). 
“Reference table, page 308. 
