.... Beds with soft-tissue preservation at the Beecher's Trilobite Bed site in the Frankfort Shale and the Martin Quarry in the Whetstone Gulf Formation (both Ordovician, New York State) are dominated by the olenid Triarthrus. A bed-by-bed analysis of the sedimentology, taphonomy, paleoecology...

... from the Devonian Hunsrück Slate in Germany and the Ordovician Beecher's Trilobite Bed in New York. Even within these Konservat-Lagerstätten, pyritization is rare, principally occurring at four horizons in the Hunsrück ( Bartels et al., 1998 ) and at one 4-cm-thick horizon at Beecher's Trilobite Bed...

...Derek E.G. Briggs; Simon H. Bottrell; Robert Raiswell Abstract Although pyrite is ubiquitous in fine-grained, organic, carbon-bearing marine sediments, it is only rarely involved in the preservation of soft-bodied organisms. Beecher's Trilobite Bed in Upper Ordovician strata of New York State...

... isotope data provide support for these associations of porewater chemistry and style of fossil pyritization. The best-described examples are for soft tissue pyritization in Beecher's Trilobite Bed (Ordovician) and the Hünsruck Slate (Devonian), where the isotopic data are consistent with rapid, early...

... depositional events accumulated within a common depositional regime. Trilobites within individual clay beds represent census assemblages of animals alive at the same time, and evidence from sedimentology, taphonomy, and stratigraphic architecture are consistent with accumulation of the whole bed within...

... ). The paleoenvironmental conditions at the Martin Quarry are relatively similar to those at Beecher’s Trilobite Bed ( Farrell and Briggs, 2008 , Farrell et al., 2009 ). Figure 1. Origin of the pyritized, egg-bearing specimens. A: Geologic and stratigraphic context (after Farrell et al., 2011 ). B: Map of New York...

... trilobite occurrences, ranging in age from Late Ordovician to Late Devonian have been reviewed in this study ( Figs. 1 – 12 ; Table 1 ). We have not deliberately focused on the most notable conservation Lagerstätten, such as the Beecher Beds, in which soft part preservation reveals truly...

... a single bed) we explore the utility of employing the ontogenetic trajectory of the cranidium as an alternative means to differentiate trilobite growth stages. This method is particularly useful for species represented solely by exuviae and disarticulated individuals. We use geometric morphometrics...

... a cluster of >100 meraspid trilobites, many complete with librigenae. The juvenile trilobites, identified as Aphelaspis sp., are mostly 1.5 to 2.0 mm total length and co-occur in multiple axial orientations on a single bedding plane. This observation, together with the attached free cheeks, indicates...

..., S = 24, E(Sn) = 16.44] Locality Reb II [ n = 671, S = 27, E(Sn) = 17.28] Locality L3 [ n = 113, S = 13, E(Sn) = 12.15] Locality A1 [ n = 331, S = 31, E(Sn) = 19.57] Frankfort Shale, Beecher's Trilobite Bed, Cincinnati, Cleveland's Glen, near Rome, New York ( Cisne 1973 : Table...

..., 1993 Triarthrus eatoni Ptychopariida Olenidae ++ ++ ++ + Ord. Katian Beecher's-type beds Pyritic Cisne, 1975 , 1981 ; Whittington & Almond, 1987 ; Farrell et al . 2009 Cryptolithus bellulus Asaphida Trinucleidae + + + o Mid.-Upp. Ord. Beecher's-type beds, Trenton...

.... The 100 m thick lower limestone and siltstone member of the Emigrant Formation at Clayton Ridge ranges in age from the Bolbolenellus euryparia / Nephrolenellus multinodus Zone (Laurentian Dyeran Stage) to the Cedaria brevifrons Zone (Laurentian Marjuman Stage; Drumian Stage; this study). The 40 trilobites...

... articulation provide the basis for the conventional stages of trilobite ontogeny: the protaspid, meraspid, and holaspid phases ( Beecher 1895 ; Chatterton and Speyer 1997 ; Raw 1925 ; Whittington 1959 ). Changes in number and shape of segments and their relations to changes in segment articulation have...

...Gabriel S. Jacobs; Jesse R. Carlucci Abstract Major transitions in trilobite ontogeny have historically been defined based on the number and distribution of trunk segments, and articulation between the trunk and cephalon. This study documents additional morphological change across the meraspid...

...Mark Webster; Frederick A. Sundberg Abstract Oryctocephalid trilobites are seldom abundant and often tectonically deformed, creating problems for robust species delimitation and compromising their utility in biostratigraphic and evolutionary studies. By studying more than 140 specimens recovered...

... the evidence of brachiopods and dacryoconarids, Boucot et al. (1999 : 850) concluded that the beds are “of definite later Early Devonian age, with the probability favouring early Emsian.” The occurrence of Plagiolaria does not help to refine the age determination, but is consistent with it. Southern...

... that the genus and the type species were based on 10 sclerites preserved on the bedding surface of a small slab of limestone ( Fig. 1 ). The slab is composed of lime mudstone, and measures 6.2 cm by 3.8 cm. It was collected from the Balang Formation, north of Tongren, eastern Guizhou, South China, and sent...

... potential autapomorphies of N. multinodus , which refute such a hypothesis, are indeed unique to this taxon. Nephrolenellus jasperensis is recognized as a junior synonym of N. multinodus . 24 01 2007 The Paleontological Society 2007 Trilobite ontogeny is traditionally subdivided...

..., the Chesley Drive Group in Cape Breton Island yields rich Furongian–Tremadocian faunas dominated by trilobites (e.g. Hutchinson, 1952 ; Landing & Fortey, 2011 ; Landing et al. 2012 ). The fossils are primarily from dark-grey, thin and nodular to bedded limestones...