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220 results for “Late Ordovician”
Data from: Xianella: a new mat-forming calcified cyanobacterium from the Middle–Late Ordovician of North China
Xianella hongii gen. et sp. nov. is described from the Middle–Late Ordovician of Shaanxi, China and interpreted as a calcified cyanobacterial sheath. Xianella filaments formed cable-like strands that constructed thick fenestral layers. The specimens occur in metre-sized limestone blocks, possibly derived from local collapse of a reefal platform margin. In combination with micrite, some of which is intraclastic and peloidal, Xianella created thick and extensive stacks of layered calcified fenestral fabric that appear to be synsedimentarily calcified open-frame mat deposits. The fenestrae range from small, laminose and very irregular, to large equidimensional areas ~2 cm across. Fenestrae with rounded outlines resemble primary gas bubbles observed in present-day microbial mats. These delicate fabrics are comparable in structure and quality of preservation with those of some Proterozoic silicified stromatolitic mats.
FIGURE 6. Ramose trepostome bryozoans from the Khrevitsa Formation. A–C in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 6. Ramose trepostome bryozoans from the Khrevitsa Formation. A–C. CNIGR museum №2/13403, Homotrypa sp. A. Longitudinal section. B. Longitudinal section showing diaphragms in mesozooecia (arrow). C. Tangential section showing mesozooecia (arrow). D, E CNIGR museum №3/13403, Stigmatella cf. claviformis (Ulrich, 1893). D. Longitudinal section. E. Longitudinal section showing acanthostyles (arrow). F, G. CNIGR museum №8/13403, Hallopora gracilens Bassler, 1927. F. Transverse section. G. Longitudinal section showing abundant diaphragms in mesozooecia (arrow). H. CNIGR museum №9/13403, Hallopora gracilens, tangential section showing mesozooecia (arrow).
FIGURE 1 in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 1. Sketch map of the Baltic-Ladoga Klint. A. Geological map (modified after Sokolova 1971), insert is shown with a dashed rectangle. B. Detailed map of the upper course of the Khrevitsa River with the bryozoan-bearing locality (arrow).
FIGURE 2 in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 2. The composite scheme of the Upper Ordovician in the Leningrad region, including strata eroded before the Devonian (biozones after Suyarkova & Koren' 2009; age dates after Gradstein et al. 2020)
FIGURE 7. Massive trepostome bryozoans from the Khrevitsa Formation. A in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 7. Massive trepostome bryozoans from the Khrevitsa Formation. A. CNIGR museum №5/13403, Diplotrypa abnormis (Modzalevskaya, 1953), colony exterior on basal side, arrow shows a crinoid segment on which a colony started to grow. B–E. CNIGR museum №4/13403, Diplotrypa abnormis. B. View on basal side with first point of growing (arrow). C. Longitudinal section showing diaphragms in autozooecia (DiA) and mesozooecia (DiM). D. Tangential section. E. Longitudinal section of colony showing a radial budding. F–H. CNIGR museum №7/13403, Monotrypa jewensis Bassler, 1911. F. Longitudinal section. G. Tangential section. H. Longitudinal section.
FIGURE 5. Trepostome and cryptostome bryozoans from the Khrevitsa Formation. A–C in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 5. Trepostome and cryptostome bryozoans from the Khrevitsa Formation. A–C. CNIGR museum №11/13403, Amplexopora sp. A. Branch colony exterior (micro-CT). B. Longitudinal section showing diaphragms (Di) and cystiphragms (Cy). C. Tangential section showing acanthostyles on the ridges (arrow). D–G. CNIGR museum №1/13403, Nematotrypa robusta (Spjeldnaes, 1984). D. Tangential section showing abundant tektitozooecia (arrow). E. Longitudinal section showing hemiphragms (arrow). F. Tangential section showing paurostyles (Pa) and acanthostyles (Ac). G. Transverse section.
FIGURE 3. Prophyllodictya khrevitsa n in Morphological features of Late Ordovician (Sandbian) bryozoans from the basin of Khrevitsa River (north-western Russia) and description of a new species of the genus Prophyllodictya Gorjunova, 1987
FIGURE 3. Prophyllodictya khrevitsa n. sp. from the Khrevitsa Formation. A_D. CNIGR museum № 13/13403. A. Colony exterior with transverse section of the branch (micro-CT). B. Tangential section (micro-CT). C. Colony exterior (micro-CT). D. Longitudinal section. E. №16/13403, transverse section showing mesotheca and lens-shaped form of branch. F. №14/13403, tangential section before ramification. G. №15/13403, transverse section showing mesotheca (arrow).
Data from: Xianella: a new mat-forming calcified cyanobacterium from the Middle–Late Ordovician of North China
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Data from: A combined morphometric and phylogenetic revision of the late Ordovician brachiopod genera Eochonetes and Thaerodonta
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Data from: Biogeographic and bathymetric determinants of brachiopod extinction and survival during the Late Ordovician Mass Extinction
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A new marrellomorph arthropod from southern Ontario: A rare case of soft tissue preservation on a late Ordovician open marine shelf
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Data from: Controls on niche stability in geologic time Congruent responses to biotic and abiotic environmental changes among Cincinnatian (Late Ordovician) marine invertebrates
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Fig. 43. Redpathoceras Flower, 1963 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 43. Redpathoceras Flower, 1963, Kallholn, Boda Limestone. A-C. Redpathoceras magnum sp. nov. A. PMU 26935, holotype; mature truncated body chamber, lateral view. B. Same specimen, view from antispihuncular side. C. PMU 26946, premature truncated phragmocone, lateral view. D-F. Redpathoceras depressum sp. nov. D. PMU 26927, holotype; mature truncated body chamber, lateral view. E. Same specimen, view from antispihuncular side. F. PMU 26931, premature truncated phragmocone, lateral view. Scale bar = 50 mm for all figures.
Fig. 42 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 42. Variation in angle of expansion in Redpathoceras Flower, 1963, Boda Limestone. R. magnum sp. nov. (grey dots); R. bullatum sp. nov. (black dots); R. depressum sp. nov. (black circles).
Fig. 32 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 32. Median cross sections of Discoceras roemeri Strand, 1934, Boda Limestone, Kallholn. A. PMU 26903. B. PMU 26904. Scale bar = 10 mm for both figures.
Fig. 28 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 28. Color marks in Isorthoceras Flower, 1962, Boda Limestone. Longitudinal striae of varying width occur in several specimen of Isorthoceras; see text for discussion. A. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov., PMU 26835, Osmundsberget. C. Isorthoceras wahlenbergi Niko, 2008, PMU 26862, Kallholn. Scale bar = 10 mm for all figures.
Fig. 31 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 31. Discoceratids of the Boda Limestone of Kallholn. A. Discoceras roemeri Strand, 1934, PMU 26903. B. Discoceras antiquissimum (Eichwald, 1842), NRM-PZ Mo 8745. Scale bar = 10 mm for both figures.
Fig. 24 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 24. Polished median section (left) and interpretation (right) of Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 190102c, Osmundsberget, Boda Limestone. Dark grey = episeptal and hyposeptal (primary?) deposits; light grey = mural (secondary?) deposits. Scale bar = 10 mm.
Fig. 23 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 23. Orthocerida of the Boda Limestone. A. Pleurorthoceras osmundsbergense sp. nov., NRM-PZ Mo 150126, holotype, Osmundsberget. B. Isorthoceras suave (Angelin in Angelin & Lindström, 1880) comb. nov.,PMU26835, Kallholn.C. Isorthocerasjunceum(Hall,1847),PMU26833, Kallholn.D-E. Isorthoceras cf. elongatocinctum (Portlock, 1843), Kallholn. D. PMU 26814, juvenile growth stage. E. PMU 26825, larger specimen with irregularly spaced transverse ornamentation. F. Isorthoceras curvilineatum sp. nov., PMU 26787, holotype, Osmundsberget. G. Isorthoceras angelini sp. nov., PMU 26774, holotype, Kallholn. H. Geisonoceras? sp., PMU 26758, Kallholn. I. Isorthoceras heroyense (Strand, 1934) comb. nov., PMU 26831, Kallholn. Scale bars: A = 10 mm; B-I = 10 mm.
Fig. 10 in The cephalopods of the Boda Limestone, Late Ordovician, of Dalarna, Sweden
Fig. 10. Camera lucida drawings of cross sections of selected Boda Limestone cephalopods. A. Cyrtorizoceras thorslundi sp. nov., PMU 26657, Osmundsberget, mature body chamber. B. Tyrioceras cf. kjaerulfi Strand, 1934, PMU 26897, Kallholn. C. Nathorstoceras adnatum sp. nov., PMU 26733, holotype, Kallholn. D. Nathorstoceras kallholnense sp. nov., PMU 26729, holotype. E. Redpathoceras depressum sp. nov., PMU 26927, holotype, Kallholn, cross section of base of mature truncated conch. F. Schuchertoceras fryi sp. nov., PMU 24744, holotype, Kalllholn, cross section of mature aperture (dark grey) and body chamber (medium grey). G. Redpathoceras bullatum sp. nov., PMU 26923, holotype, Kallholn, cross section of base of mature truncated conch. Prosiphuncular side directed downward in all figures. Siphuncles shown as white circles. Scale bar = 10 mm for all figures.
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