Sample Detail of
Sample: Sample No. 78AHr146 -- USGS No. Mesozoic loc. D10708
Locality: Field No. 78AHr146
Description: Lat. 59o 53.1 min. N., Longitude 158o 55.5 min. W.: sec. 28, T. 3 S., R. 56 W. Limestone within thick section of graywacke and shale; small outcrop on south shore of Nuyakuk Lake about 0.5 km east of obvious promontory. [Silberling et al., 1997, p. 19 provide same locality data, but not that this locality is in Togiak(?) terrane]
Location: Alaska Quadrangle: Dillingham D-8
Township&Range: T3S R56W Section: Sec.28
Lat.: 59o53.1 ' Long.: 158o55.5 '
Reference
Title: Report on Referred Fossils ,  1979 (05/10)
Report by: Norman J. Silberling
Referred by: Joseph M. Hoare
Age: Norian (late Norian)
Comment:This collection is of late Norian age as is the old collection from nearby locality made by Mertie (USGS Mesozoic loc. 17080) which consists mostly of scraps of Monotis, some in obviously water-worn pieces of rock.
Occurrence(s)
No. Group Name Qty Notes
1 Hydrozoans Heterastridium sp.
2 Bivalves Monotis sp.
3 Bivalves indet. pectenacid bivalve

Title: The Late Triassic Bivalve Monotis in Accreted Terranes of Alaska ,  1997
ABSTRACT--Late Triassic bivalves of the genus Monotis occur in at least 16 of the lithotectonic terranes and subterranes that together comprise narly all of Alaska, and they also occur in the Upper Yukon region of Alaska where Triassic strata are regarded as representing non-accretionary North America. On the basis of collections made thus far, 14 kinds of Monotis that differ at the species or subspecies level can be recognized from Alaska. These are grouped into the subgenera Monotis (Monotis), M. (Pacimonotis), M. (Entomonotis), and M. Eomonotis. In places, Monotis shells of one kind or another occur in rock-forming abundance.

On the basis of superpositional data from Alaska, as well as from elsewhere in North America and Far Eastern Russia, at least four distinct biostratigraphical levels can be discriminated utilizing Monotis species. Different species of M. (Eomonotis) characterizes two middle Norian leves, both probably within the upper middle Norian Columbianus Ammonite Zone.
Report by: Norman J. Silberling , J. A. Grant-Mackie , K. M. Nichols
Age: Norian
Formation: Unknown (No Data)
Comment:"Locality 28 (USGS Mesozoic locs. 17080 and D10708) is along the boundary between the Togiak and Tikchik terranes. It is in rocks that probably represent the older parts of the Togiak terrane, the underlying Tikchik terrane being either part of a subduction complex structurally below the Togiak or perhaps even part of the original depositional substrate of the Togiak. Thus, the Monotis occcurrences in southwestern Alaska are probably representative of a single, major, heterogeneous Mesozoic intraoceanic arc and its accretionary subduction complex, all of which were amalgamated by Early Cretaceous time (Box, 1985)." (from Silberling et al., 1997, p. 10)

[Note by R.B. Blodgett - No species list provided for this locality in this publication]