Middle Ordovician graptolite
fauna from Praha--Cerveny vrch (Prague Basin, Czech Republic).
Alum shale, as well as graptolite
argillite, contains remarkably high concentrations of trace metals such as U, Mo, V and Ni, but may also be locally enriched with rare earth elements (REE), Cd, Au, Sb, As, Pt .
The upper parts of the Bear River formation in the northwestern area and Feltzen formation in the southeastern areas locally contains the Early Ordovician graptolite
Rhabdinopora flabelliformis, suggesting that the underlying Acacia Brook, Cunard, Bloomfield, and Moshers Island formations are Middle to Late Cambrian, and that a significant unconformity exists between the Halifax Group and the overlying Silurian White Rock Formation.
For this purpose the FADs of five graptolite
biozonal species and nine ostracode indices in the Latvian sections are shown according to data from Gailite et al.
The boundary between the Hunneberg and Billingen "groups" (later referred to as stages, substages or series) was placed between the Megistaspis (Paramegistaspis) planilimbata and Megalaspides dalecarlicus trilobite biozones when established (Tjernvik 1956), coinciding with the lower boundary of the Phyllograptus densus graptolite
Major and minor elements in Estonian graptolite
Accordingly, this cosmopolitan graptolite
is used as the main correlation criterion for the boundary of the Fifth Stage as well as the Upper Ordovician Series worldwide (e.
Sutherland, University of Oklahoma, for permitting the loan of Decker's graptolite
As was mentioned above, in the study area the main sources of high Rn concentrations in soil air are the Lower-Ordovician U-rich rocks, graptolite
argillite, and obolus sandstone (phosphorite), and among the Quaternary deposits, clasts and fines of the above-mentioned rocks and to a lesser extent the Quaternary deposits enriched with erratic granitoid material of the rapakivi formation.
Orthograptus uplandicus appears approximately at this level (Mannil 1984).
Patterns and processes of latest Ordovician graptolite
extinction and recovery based on the data from South China.
Understanding the paleoclimate of the Rheic Ocean at the beginning of the Mississippian Period, throughout the Kinderhookian, will help determine the spatial and temporal limits of the dendroid Graptolite
Dictyonema within Missouri.