.... 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...

... ( Conway Morris, 1986 ; Wilby et al., 1996 ; Gabbott et al., 2004 ; Van Roy, 2006 ; Cai and Hua, 2007 ; Farrell and Briggs, 2007 ), widespread pyritization of animal soft tissues is known only from the Devonian Hunsrück Slate in Germany and the Ordovician Beecher's Trilobite Bed in New York. Even...

...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 ). Due to the small number of specimens available for study, there is no observed relationship between the size of the trilobite and presence of eggs...

... preservation of in situ behavior, including mass aggregations and molt ensembles. Most occurrences contain bedding planes in which trilobites exhibit incipient disarticulation. These assemblages were buried by cascades of flocculated sediment from hypopycnal, detached flows. Type II assemblages show well...

... 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...

... [ n = 303, S = 14, E(Sn) = 10.16] Locality 9, Abercwmeiddaw quarry, deep subtidal [ n = 64, S = 16] 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 1 ), pyritized, siltstone...

... –87. Farrell , Ú. C. , Martin , M. J. , Hagadorn , J. W. , Whiteley , T. & Briggs , D. E. G. 2009 . Beyond Beecher's Trilobite Bed: widespread pyritization of soft tissues in the Late Ordovician Taconic foreland basin . Geology 37 , 907 –10. Fortey , R...

..., the studies of trilobites and other fossils from the Balang Formation reveal some level of consistency in preservational features among the beds. Specimens occur along bedding planes, and are usually partially or completely articulated. While they are quite common along certain bedding surfaces...

... 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...

.... 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...

... 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...

..., whereas as revised here, it is considered to be a junior synonym of Arthricocephalus . Large collections of oryctocephalid trilobites, including some topotypic material, have been amassed from the Balang Formation in eastern Guizhou and western Hunan onward from about 1961 (see Qian, 1961 ; Zhou...

...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...

... of Paleontology , 79 . 542 – 563 . Adrain , J. M. , S. R. , and Westrop , 2006 , New earliest Ordovician trilobite genus Millardicurus: the oldest known hystricurid : Journal of Paleontology , 80 . 650 – 671 . Beecher , C. E. , 1895 , The larval stages of trilobites : American...