The Perd'e Fogu outcrop: a classical exposure of "
Orthoceras limestone" in the Fluminimaggiore area (SW Sardinia).
Looking more closely, though, you notice, emerging from the bottles' depths, the telltale signs of
orthoceras -- those squid-like things that paleontologists claim used to use ice cream cones to dart around through Ordovician seas before becoming the stuff of limestone.
Genus: CODONELLOPSIS JAlrgensen 1924 Codonellopsis longa Kofoid and Campbell 1929 Codonellopsis morchella (Cleve) JAlrgensen 1924 Codonellopsis
orthoceras (Haeckel) JAlrgensen 1924 Codonellopsis schabi (Brandt) Kofoid and Campbell 1929
0.9 [+ or -] 0.2 1.8 [+ or -] 0.4 Anaphalis margaritacea 5.1 [+ or -] 1.2 3.6 [+ or -] 0.7 Antennaria rosea 7.6 [+ or -] 1.6 1.8 [+ or -] 0.0 Arenaria congesta 1.0 [+ or -] 0.2 Arnica cordifolia 0.7 [+ or -] 0.2 1.2 [+ or -] 0.5 Arnica sororia 2.7 [+ or -] 0.5 6.3 [+ or -] 0.0 Balsamorhiza sagittata 3.8 [+ or -] 0.6 Barbarea
orthoceras Besseya rubra 0.3 [+ or -] 0.0 Calochortus elegans 0.3 [+ or -] 0.0 Calochortus eurycarpus 0.5 [+ or -] 0.1 0.3 [+ or -] 0.0 Camassia quamash ssp.
The marls contain
orthoceras (Riba, 1949) and have been attributed to the Pragian (Garcia-Lopez et al., 1990).
* *
Orthoceras strictum * * * Oxalis perennans * * * Pelargonium australe * * Phragmites australis * * * * Portulaca oleracea * * * Prasophyllum spp.
These three units are highly fossiliferous and correspond to the '
Orthoceras limestones', now referred to as the Cephalopod Limestone Biofacies (e.g.
The colour pattern in 'Orthoceras' columnare Marklin was described by Angelin & Lindstrom (1880) for a small shell fragment from Gotland of uncertain taxonomic affinity.
Thus, Orthoceras columnare may be tentatively placed to Lyecoceras.
On color bands in Orthoceras. Bulletin New York State Museum, 227, 63-130.
The graptolite fauna of the Lower
Orthoceras limestone Halluden, Oland, and its bearing on the evolution of the lower Ordovician graptolites.