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Little Cedar Formation

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Exposure of the Lower Rapid Biostrome of the Little Cedar Formation, Cedar Valley Group, at the Devonian Fossil Gorge near Coralville, Iowa. Two characteristic and easily identifiable corals at the Gorge are Hexagonaria (upper right; visible portion of the specimen is approximately 10 cm across) and the ‘honeycomb coral’ Favosites (at center). Photo by Corey Bruse.
Published: 01 October 2012
Figure 1. Exposure of the Lower Rapid Biostrome of the Little Cedar Formation, Cedar Valley Group, at the Devonian Fossil Gorge near Coralville, Iowa. Two characteristic and easily identifiable corals at the Gorge are Hexagonaria (upper right; visible portion of the specimen is approximately 10
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Figure2—Conularia milwaukeensis from the Little Cedar Formation (Middle Devonian, upper Givetian) in Fayette, Iowa, SUI 62676. SEM photomicrographs of a compressed specimen preserving remnants of the two carinate corners as well as the two noncarinate corners. Specimen etched for 15 seconds in 5% HCl, then coated with gold and photographed in secondary electron mode (1) and compositional backscattered electron mode (2–4). 1, Transverse cross section approximately 4 mm above (adapertureward of) the apical end, which is covered by a schott. The two corners in the plane perpendicular to the direction of compaction exhibit a low internal carina (one of which is indicated by an arrow), ×15; 2, detail of the noncarinate corner (arrow) at the top of 1, ×200; 3, detail of the internal carina (arrow) on the left side of 1, ×120; 4, detail of the internal carina (arrow) on the right side of 1, ×120
Published: 01 March 2006
Figure 2 — Conularia milwaukeensis from the Little Cedar Formation (Middle Devonian, upper Givetian) in Fayette, Iowa, SUI 62676. SEM photomicrographs of a compressed specimen preserving remnants of the two carinate corners as well as the two noncarinate corners. Specimen etched for 15 seconds
Journal Article
Published: 01 July 1998
Journal of Paleontology (1998) 72 (4): 726–737.
...Frederick S. Rogers Abstract The Little Cedar and lower Coralville formations of the Cedar Valley Group (Middle Devonian) of Iowa were deposited on a cratonic, shallow-water, carbonate and evaporite shelf during the Taghanic onlap. Four conodont subzones, zones, or cratonic biofacies faunas can...
Journal Article
Journal: PALAIOS
Published: 01 August 2004
PALAIOS (2004) 19 (4): 396–407.
... of conspecific neighbors. Taxa that exhibit clustering greater than expected under the random model probably clustered in life, revealing features of the local spatial structure. An example of the method is presented, using bedding planes from the Rapid Member of the Little Cedar Formation at the Devonian Fossil...
FIGURES
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FIGURE 3—Typical bedding surfaces of Unit 9, Rapid Member of the Little Cedar Formation. (A) Surface showing probable mixed taphonomic regimes. Note excellent preservation of crinoid calyx and bryozoan fronds, mixed with fragments and disarticulated brachiopod shell. (B) Surface showing conspecifically clustered Spinatrypa bellula. Note concentric lamellose frills extended into spines
Published: 01 August 2004
FIGURE 3 —Typical bedding surfaces of Unit 9, Rapid Member of the Little Cedar Formation. (A) Surface showing probable mixed taphonomic regimes. Note excellent preservation of crinoid calyx and bryozoan fronds, mixed with fragments and disarticulated brachiopod shell. (B) Surface showing
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Structure map on top of the Smackover Formation, Little Cedar Creek field. Note uniform dip to the southwest at a rate of 150–200 ft/mi (46–61 m/km).
Published: 01 November 2013
Figure 10 Structure map on top of the Smackover Formation, Little Cedar Creek field. Note uniform dip to the southwest at a rate of 150–200 ft/mi (46–61 m/km).
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(A) Upper Jurassic Smackover Formation thrombolite, Little Cedar Creek field, Alabama. The grayish colors are the microbial structures, and the brownish colors are diagenetic cements. (B) Thin-section image showing the microbial structures formed by syndepositional peloid cementation (dark components), mosaic and blocky calcite diagenetic cements (bright yellow), and pores (blue). (C) Cathodoluminescent thin-section image. The microbial structures are dull, the calcite mosaic cement phase has a low bright-brown color, and the blocky calcite cement has a zonation from low bright brown to bright yellow. (D) Reconstruction of the original microbial framework and subsequent cementation phases. The microbial structures are shown in brown, the calcite mosaic cement is shown in pink, the blocky calcite cement is shown in purple, and the pores are shown in light blue.
Published: 01 November 2013
Figure 6 (A) Upper Jurassic Smackover Formation thrombolite, Little Cedar Creek field, Alabama. The grayish colors are the microbial structures, and the brownish colors are diagenetic cements. (B) Thin-section image showing the microbial structures formed by syndepositional peloid cementation
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Structure map on top of the Norphlet Formation, Little Cedar Creek field. Note uniform dip to the southwest at a rate of 150–200 ft/mi (46–61 m/km).
Published: 01 November 2013
Figure 11 Structure map on top of the Norphlet Formation, Little Cedar Creek field. Note uniform dip to the southwest at a rate of 150–200 ft/mi (46–61 m/km).
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Figure1—Conularia milwaukeensisCleland, 1911 from the Middle Devonian (Givetian) of Iowa and Wisconsin. 1, Light photograph of a specimen from the Little Cedar Formation in Fayette, Iowa, SUI 62673 (scale bar = 1 cm). The arrow marks a pigmented longitudinal line located near the actual midline of that face; 2–5, scanning electron photomicrographs (low voltage, secondary electron mode) of uncoated specimens from the Milwaukee Formation near Milwaukee, Wisconsin; 2, portion of a carinate corner sulcus, showing the longitudinally striated outer surface (inclined arrow) and an oblique cross section through the carina (horizontal arrow), MPM 1237, ×50. Note also the longitudinal ridges in the interspaces; 3, portion of the holotype (near the center of one face), showing the geometry of several transverse ribs in the vicinity of the midline, USNM 85988, ×30; 4, portion of a face (between the midline and a corner sulcus) of one of the paratypes, showing wide separation of minute, broken nodes (arrows) on the transverse ribs, USNM 78212, ×35; 5, portion of a face of one of the paratypes, showing some of the unbroken nodes (arrows), USNM 78212, ×90
Published: 01 March 2006
Figure 1 — Conularia milwaukeensis Cleland, 1911 from the Middle Devonian (Givetian) of Iowa and Wisconsin. 1, Light photograph of a specimen from the Little Cedar Formation in Fayette, Iowa, SUI 62673 (scale bar = 1 cm). The arrow marks a pigmented longitudinal line located near the actual
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A) Chronostratigraphic and lithostratigraphic chart of Middle–Late Devonian time periods covered in this study. Based on Day et al. (2006) and Morrow and Sandberg (2008). Ages (mya) from Kaufmann (2006). Chronostratigraphic placement of lithostratigraphic units after Witzke et al. (1989), Day et al. (2006), Morrow and Sandberg (2008), Warme et al. (2008)), Sandberg (2009), and personal communication J. Day and B. Witzke (2011). Thicknesses of each lithostratigraphic unit measured in this study are indicated in parentheses. Location and stratigraphic extent of measured sections in B) Nevada (all sections hung from the Fox Mountain Formation–Guilmette Formation contact) and C) Iowa (all sections hung from the Little Cedar Formation–Coralville Formation contact). Note the difference in scale bars for distance and stratigraphic thickness in the two panels. Locations of studied sections are indicated by black (outcrop) and white (cores) stars. Two-letter abbreviations refer to individual measured section localities: HS, Hancock Summit; MS, Mail Summit; ER, Egan Range; SC, Schell Creek; OR, Osage Roadcut; FM, Floyd Mitchell core; FR, Floyd Roadcut; GC, Garrison Core; SP, MacBride Spillway; KC, Klein Core; FP, Fox Point; MB, Mehaffey Bridge; IP, IPSCO PPW core; HC, H-29 Core. See Brady (2012) for detailed locality information.
Published: 01 April 2015
sections in B) Nevada (all sections hung from the Fox Mountain Formation–Guilmette Formation contact) and C) Iowa (all sections hung from the Little Cedar Formation–Coralville Formation contact). Note the difference in scale bars for distance and stratigraphic thickness in the two panels. Locations
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The Morrison Formation overlying the red beds of the Summerville Formation and overlain by the Buckhorn Conglomerate at Little Cedar Mountain, 3 km south of the Buckhorn type section.
Published: 01 March 2007
Figure 4 The Morrison Formation overlying the red beds of the Summerville Formation and overlain by the Buckhorn Conglomerate at Little Cedar Mountain, 3 km south of the Buckhorn type section.
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Stereoscopic triplets of Irons Fork Mountain and Brushy Knob Formations. Symbols: Pal-MPjv, Johns Valley and Lower Atoka; Mjb, Brushy Knob Formation; Mji, Irons Fork Mountain Formation; Ms, Stanley Group (Chickasaw Creek and Moyers Formations).
Published: 01 March 1971
. Reference section, left : Irons Fork Mountain and Brushy Knob Formations along north flank of Little Cedar Creek anticline near Forked Mountain. Note double sandstone ridges of basal Irons Fork Mountain which contrast with massive, ridge-forming Brushy Knob. Chickasaw Creek Formation contains several large
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Structure maps: (A) on top of the Smackover deeper water, subtidal lime mudstone and (B) on top of the Smackover Formation in the Little Cedar Creek field area illustrating the absence of structural closure in the field.
Published: 01 April 2008
Figure 6 Structure maps: (A) on top of the Smackover deeper water, subtidal lime mudstone and (B) on top of the Smackover Formation in the Little Cedar Creek field area illustrating the absence of structural closure in the field.
Journal Article
Journal: AAPG Bulletin
Published: 01 April 2008
AAPG Bulletin (2008) 92 (4): 417–442.
...Figure 6 Structure maps: (A) on top of the Smackover deeper water, subtidal lime mudstone and (B) on top of the Smackover Formation in the Little Cedar Creek field area illustrating the absence of structural closure in the field. ...
FIGURES | View All (17)
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Structure maps: (A) on top of the Norphlet Formation and (B) on top of the Smackover transgressive subtidal lime mudstone and dolomudstone to wackestone in the Little Cedar Creek field area illustrating the absence of structural closure in the field.
Published: 01 April 2008
Figure 5 Structure maps: (A) on top of the Norphlet Formation and (B) on top of the Smackover transgressive subtidal lime mudstone and dolomudstone to wackestone in the Little Cedar Creek field area illustrating the absence of structural closure in the field.
Journal Article
Published: 01 November 1959
Journal of Paleontology (1959) 33 (6): 1001–1017.
...David Lawrence Dunn Abstract Two new occurrences of some relatively little known microfossils are reported. These microfossils, called chitinozoans, are believed to represent an extinct order of rhizopod protozoans. The fauna described is that of the Devonian Cedar Valley formation, and represents...
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—Stratigraphic section of Irons Fork Mountain and lower Brushy Knob Formations, Little Cedar Creek, Sec. 33, T3N, R19W. Thicknesses are in feet. Numbers and letters within each central column are flysch subfacies. This is reference section for Irons Fork Mountain Formation (Morris, 1971a).
Published: 01 May 1975
Fig. 7 —Stratigraphic section of Irons Fork Mountain and lower Brushy Knob Formations, Little Cedar Creek, Sec. 33, T3N, R19W. Thicknesses are in feet. Numbers and letters within each central column are flysch subfacies. This is reference section for Irons Fork Mountain Formation (Morris, 1971a).
Journal Article
Journal: PALAIOS
Published: 24 July 2018
PALAIOS (2018) 33 (7): 296–311.
... of the Cedar Mesa Formation. Thin, laterally discontinuous and crossbedded, medium-grained sandstones are observed throughout the HF, though they compose little of the formation volumetrically. These beds were deposited by fluvial reworking of sediment likely sourced from the highlands of the Uncompagre...
FIGURES | View All (8)
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Location map showing major structural features and the approximate updip limit of the Smackover Formation in southwestern Alabama (modified from Mancini et al., 2004). Note the location of key Smackover fields, including the Little Cedar Creek field.
Published: 01 April 2008
Figure 1 Location map showing major structural features and the approximate updip limit of the Smackover Formation in southwestern Alabama (modified from Mancini et al., 2004 ). Note the location of key Smackover fields, including the Little Cedar Creek field.
Journal Article
Journal: Geology
Published: 20 September 2024
Geology (2024) 52 (12): 885–890.
... architecture of these intersections nor the duration of the martian fluvial activity they represent. Here, we analyze a fluvial ridge intersection in the Cretaceous Cedar Mountain Formation of eastern Utah, USA, that we interpret to reflect the evolution of a river channel avulsion node exposed in 3-D. Through...
FIGURES | View All (4)