..., Mastigograptus gracillimus (Lesquereux), crinoid stem and plates, Lingula cf. philomela Billings, Rafmesquina alternata centristriata Ruedemann, Rhynchotrema increbescens (Hall), Allodesma sp., Cryptolithus tessellatus Green, Isotelus sp. 5 38 253 Dense-to-finely crystalline brownish gray...

... development of trinucleids was obtained by Whittington (1959b) from growth series of Cryptolithus tessellatus Green, 1832 and Tretaspis sagenosus McCoy, 1849 from the Caradoc of northern Virginia, USA. Hughes et al. (1975) summarized the literature on trinucleid ontogeny up to the early 1970s...

... occurring in the basal part of the Viola noted previously, numerous graptolites occur at intervals through more than 900 feet of limestone, and several of the graptolite zones of the Viola occur in the Big Fork chert of eastern Oklahoma and Arkansas. Also, the trilobite, Cryptolithus tessellatus , so...

... Fork, enough have been collected from several zones, with Cryptolithus tessellatus traced into it, to show the practical equivalence of the Big Fork of the Ouachita Mountains and a part of the Viola limestone of the Arbuckle Mountains. Table III shows the practical equivalence of the Sylvan...

... ). Of the over 200 species that occur within the Kope, the trilobite Cryptolithus tessellatus Green 1832 and the brachiopod Sowerbyella rugosa (Meek 1873) are of particular interest because they are abundant, characteristic of the Kope, and absent in immediately overlying strata. Cryptolithus is not known...

... of the Viola, a mile south of Sulphur, Oklahoma. It is characteristically light gray or pink with all of its dark periderm exfoliated. It occurs with numerous parts of the trilobite Cryptolithus tessellatus Green. Because of its complete exfoliation, exterior details of structure characteristic of one of its...

...H. B. Whittington Abstract Cephalon fringe pits, C. lorettensis 4 rows, C. tessellatus 3 rows, both in early Barneveld beds, C. bellulus more widespread, in strata of Eden age GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North...

...: “The Athens is equivalent to the Normanskill of New York and the lower Dicellograptus shales of Sweden.” In considering the Trenton of New York he gives a section in which he lists: Rafinesquina deltoidea , Diplograptus amplexicaulis , and Cryptolithus tessellatus , three species which are common...