Orthoceras


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Or`thoc´e`ras


n.1.(Paleon.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
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.
* * 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.