Journal of Paleontology; March 2009; v. 83; no. 2;
p. 299-306; DOI: 10.1666/08-123.1
© 2009 Paleontological Society
The First Remopleuridioidean Trilobite and the Earliest Parabolinella Species Recorded in the Furongian of Scandinavia
Fredrik Terfelt1 and
John Ahlgren2
1 GeoBiosphere Science Centre, Department of Geology, Lund University, Sölvegatan 12, SE-223 62, Lund, Sweden, <fredrik.terfelt@geol.lu.se>
2 Gärdesgatan 10, SE-542 43, Mariestad, Sweden, <jompa.ahlgren@tele2.se>
| The first 20% of the full text of this article appears below.
|
 |
INTRODUCTION
|
|---|
THE FURONGIAN of Mount Kinnekulle, Västergötland, Sweden (Fig. 1) is exposed in a number of road cuts, stream cuts, and abandoned alum shale quarries scattered around the mountain (e.g., Westergård, 1922, fig. 18; Müller and Hinz, 1991, fig. 2). Stratigraphically, the exposed successions span the Olenus gibbosus Zone through the Peltura paradoxa Zone (Fig. 2), and they have a maximum thickness of ca 12 m (Westergård, 1943). The strata consist of interfingering layers of alum shale and bituminous limestone (colloquially referred to as "orsten"). Trilobites, predominantly olenids, occur frequently throughout the succession, although they are generally restricted to the limestones. During an investigation of trilobites in the Trilobagnostus holmi Zone (Fig. 2) at two localities on Kinnekulle, the second author (JA) recovered two unusual trilobites. After a closer examination they could be assigned to Elkanaspis Ludvigsen, 1982 and Parabolinella Brøgger, 1882, both of which are extremely rare in the Furongian of Scandinavia.
View larger version (53K):
|
FIGURE 1—Map of southern Scandinavia. 2, Close up map of the Mount Kinnekulle area, south-central Sweden. 3, Detail map of the southern part of Mount Kinnekulle, showing the collecting localities
|
|
View larger version (19K):
|
FIGURE 2—Biostratigraphic zonation of the Furongian in Scandinavia (modified from Terfelt et al., 2008)
|
|
The remopleuridioidean trilobite Elkanaspis has been recorded in upper Furongian through lower Ordovician strata of North America (Rasetti, 1944; Ludvigsen, 1982; Ludvigsen et al., 1989; Westrop, 1995; Robison and Pantoja-Alor, 1968), China (Kuo et al., 1982; Duan et al., 1986; Peng, 1990), and Korea (Kim and Choi, 2000). All North American representatives are recorded from the Furongian (Landing et al., 2007; Ludvigsen, 1982; Ludvigsen et al., 1989. . . [Full Text of this Article]
Copyright © 2009 by Paleontological Society
