Sur quelques Chitinozoaires ordoviciens du Québec et de l'Ontario, Canada

1975 ◽  
Vol 12 (6) ◽  
pp. 1006-1018 ◽  
Author(s):  
Francine Martin
Keyword(s):  
Trenton Group

Rich Chitinozoa assemblages of the Trenton Group and of the Utica Formation at the Montmorency Falls (Province of Quebec) are compared to an assemblage of the Eastview Formation, at Ottawa (Province of Ontario). Fourteen species of which three are new (Conochitina naevia, C. kjellstromi and Ancyrochitina barbescens), and three subspecies are described.

The Walcott-Rust Quarry: Middle Ordovician trilobite Konservat-Lagerstätten

1999 ◽  
Vol 73 (2) ◽  
pp. 288-305 ◽  
Author(s):  
Carlton E. Brett ◽  
Thomas E. Whiteley ◽  
Peter A. Allison ◽  
Ellis L. Yochelson
Keyword(s):  
New York ◽  
Direct Evidence ◽  
Post Mortem ◽  
Benthic Organisms ◽  
Middle Ordovician ◽  
Trenton Group ◽  
Micritic Limestones

The Walcott-Rust Quarry, at Trenton Falls, New York, has yielded a large number of well-preserved, fully articulated fossils from the lower third of the Middle Ordovician Rust Formation, Trenton Group. Along with three species of the more common trilobites from the Trenton Group, fourteen species of rare and uncommon trilobites are found within a thin package of micritic limestones and shales. The first trilobites with preserved appendages, Ceraurus pleurexanthemus Green, 1832 and Flexicalymene senaria (Conrad, 1842), were described from one layer from this quarry. Unique specimens of Isotelus walcotti UIrich in Walcott, 1918, and Sphaerocorphe robusta Walcott, 1875, were found in the next higher bed. Re-excavation of the quarry yielded information about the taphonomy of the trilobites and stratigraphy of the trilobite layers. Nearly half of the beds surveyed (n = 50) yield direct evidence of obrution (i.e., rapid post-mortem or live burial) of benthic organisms. Unusual anaerobic microenvironments in partially enrolled trilobites of the Ceraurus layer facilitated very early calcification of appendages and other soft parts.

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