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Hog's Back Formation

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Journal Article

Hog's Back Formation: a new (Middle Ordovician) stratigraphic unit, Ottawa Embayment, eastern Ontario, Canada Free

Osman Salad Hersi, George R. Dix
Published: 01 May 1997
Canadian Journal of Earth Sciences (1997) 34 (5): 588–597.
DOI: https://doi.org/10.1139/e17-047
...Osman Salad Hersi; George R. Dix Abstract The Hog's Back Formation, exposed in Ottawa, Ontario, is a new stratigraphic unit that disconformably overlies the Rockcliffe Formation and underlies, with apparent conformity, the Pamelia Formation of the Ottawa Group. The Hog's Back Formation is 14.3 m...
Add to Citation Manager for <span class="search-highlight">Hog&#x27;s</span> <span class="search-highlight">Back</span> <span class="search-highlight">Formation</span>: a new (Middle Ordovician) stratigraphic unit, Ottawa Embayment, eastern Ontario, Canada
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Facies attributes of the Hog's Back Formation. A) Outcrop photograph illustrating transition up into thick dolomudstone beds near the base of the upper division of the formation, Loc. 8a. Thickest dolostone bed is 1.4 m. B) Uppermost 3 m of the upper division strata at Loc. 6 illustrating higher-order succession (between two white arrows) of shaly (dark) dolomitic limestone succeeded upsection by silty dolomitic mudstone and microcrystalline dedolomite, and two intervals (black arrows) of thin beds of resistant skeletal rich limestones. The upper white arrow is the top of the formation correlative to the Figure 6G. Vertical exposure of outcrop section is 4 meters. C) Core photograph of burrowed dolomudstone in the lower Hog's Back Formation; Loc. 9. Scale bar  =  1 cm. D) Core photograph of biomottled fabric associated with the first appearance of the brachiopod Rostricellula plena and associated pelecypod shell fragments; Loc. 9. Scale bar  =  1 cm. E) Core photograph of abrupt erosional top of skeletal-rich dolomitic limestone, with overlying mudstone bearing local intraclasts of lime mudstone; Loc. 9. Scale bar  =  1 cm.

Facies attributes of the Hog's Back Formation. A) Outcrop photograph illu... Available to Purchase

Published: 01 June 2013
Figure 13 Facies attributes of the Hog's Back Formation. A) Outcrop photograph illustrating transition up into thick dolomudstone beds near the base of the upper division of the formation, Loc. 8a. Thickest dolostone bed is 1.4 m. B) Uppermost 3 m of the upper division strata at Loc. 6
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Succession of events leading to the Rockcliffe–Hog's Back formation transition, Loc. 8. A) Deposition of sandstone, shale, and anomalous facies S3. B) Local erosion at Loc. 8a removes ∼ 0.5 m of sandstone. C) Two possible solutions are related to structural control: solution Ci incorporates a fault between Loc. 8a and 8b, with subsidence allowing an additional 1.5 m of Rockcliffe-like sandstone, including facies S4, formation of several disconformities, and disrupted bedding; solution Cii incorporates a fault east of Loc. 8a, coincident with the trace of a present-day fault that offsets Carillon and Rockcliffe strata (see inset map in Fig. 8). D) Re-establishment of deposition accommodates high-order stratigraphic continuity in the Hog's Back Formation overlapping the disconformity-bounded body of Rockcliffe strata between Loc. 8a and 8b.

Succession of events leading to the Rockcliffe–Hog's Back formation transit... Available to Purchase

Published: 01 June 2013
Figure 15 Succession of events leading to the Rockcliffe–Hog's Back formation transition, Loc. 8. A) Deposition of sandstone, shale, and anomalous facies S3. B) Local erosion at Loc. 8a removes ∼ 0.5 m of sandstone. C) Two possible solutions are related to structural control: solution Ci
Journal Article

Tectonostratigraphy of the Chazyan (Late Middle–Early Late Ordovician) Mixed Siliciclastic–Carbonate Platform, Quebec Embayment Available to Purchase

George R. Dix, Odette Nehza, Itor Okon
Published: 01 June 2013
Journal of Sedimentary Research (2013) 83 (6): 451–474.
DOI: https://doi.org/10.2110/jsr.2013.39
...Figure 13 Facies attributes of the Hog's Back Formation. A) Outcrop photograph illustrating transition up into thick dolomudstone beds near the base of the upper division of the formation, Loc. 8a. Thickest dolostone bed is 1.4 m. B) Uppermost 3 m of the upper division strata at Loc. 6...
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View PDF for article title, Tectonostratigraphy of the Chazyan (Late Middle–Early Late Ordovician) Mixed Siliciclastic–Carbonate Platform, Quebec Embayment
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Regional lithostratigraphy and facies distribution of the Hog's Back Formation, and bounding stratigraphic units in the western and central Ottawa Embayment.

Regional lithostratigraphy and facies distribution of the Hog's Back Format... Available to Purchase

Published: 01 June 2013
Figure 7 Regional lithostratigraphy and facies distribution of the Hog's Back Formation, and bounding stratigraphic units in the western and central Ottawa Embayment.
Image
Lithic characteristics of formations and their boundaries. A) Cross-bedded skeletal limestone, part of a carbonate-rich interval of the Laval Formation, Loc. 12. Hammer for scale. B) Dolostone (a) of the Carillon Formation overlain disconformably by pebble conglomerate (b), then quasi-planar-stratified sandstone (c) of the Rockcliffe Formation; Loc. 4. Section of meter stick (left) is 50 cm in height. C) Shale and sandstone of the basal Hog's Back shale overlying a gravel-lined, burrowed, erosional surface (arrow) developed on Rockcliffe sandstone; Loc. 5. Width of core is 7 cm. D) River exposure at Loc. 6 showing the Rockcliffe Formation (a) overlain by the shale-rich lower Hog's Back Formation (b), and thick-bedded carbonate (set back in the trees) of the upper Hog's Back Formation. Vertical scale bar  =  1 m. E) Basal shale of the Pamelia Formation in core, Loc. 9, overlying burrowed dolomudstone of the Hog's Back Formation. Vertical ruler is in centimeters (left) and inches (right). F) Argillaceous carbonate (dolomitic dedolomite) of the upper Hog's Back Formation at Loc. 6 and resistant thin (&lt; 5–15 cm) beds (white arrows) of skeletal limestone. G) Contact (at water line) between lowermost shale (a) of the Pamelia Formation and the Hog's Back Formation. The uppermost thin skeletal limestone of the latter formation (lower arrow) occurs ∼ 20 cm beneath the formation contact (at the water line), and displays a disrupted, convoluted geometry (see Fig. 14B). Thick-bedded sandstone (upper arrow), shale, and limestone of the lowermost Pamelia Formation is exposed.

Lithic characteristics of formations and their boundaries. A) Cross-bedde... Available to Purchase

Published: 01 June 2013
), then quasi-planar-stratified sandstone (c) of the Rockcliffe Formation; Loc. 4. Section of meter stick (left) is 50 cm in height. C) Shale and sandstone of the basal Hog's Back shale overlying a gravel-lined, burrowed, erosional surface (arrow) developed on Rockcliffe sandstone; Loc. 5. Width of core is 7
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Lithostratigraphic correlation between Loc. 8, with its three closely spaced sections (see inset for geographic positions), and Loc. 6, which is the type section of the Hog's Back Formation (Salad Hersi and Dix 1997). Correlative beds between Loc. 8 and 6 occur only above a single bed of a dark gravel-bearing wacke (facies S3, labeled B) at Loc. 6. Symbols are the same as in Figure 7. Also shown are sandstone facies (e.g., S1a; see Table 1); and the stratigraphic positions of reported faunal assemblages: open star, ostracodes: Copeland et al. (1989); black star, brachiopod-rich (R. plena) bed: Wilson (1946) and Salad Hersi and Dix (1997), with additional sites for this brachiopod marked by an inverted black triangle; and, gray star for conodonts (McCracken 1995). At Loc. 8, the Hog's Back Formation oversteps a disconformity-bounded wedge (A) of Rockcliffe strata that pinches out to the west. The sedimentary wedge contains intervals of deformed bedding and gravelly facies (S4). Loc. 8a is adjacent to the trace of a present-day fault juxtaposing the Carillon (C) and Rockcliffe (R) formations (see inset map; based on Williams et al. 1984).

Lithostratigraphic correlation between Loc. 8, with its three closely space... Available to Purchase

Published: 01 June 2013
Figure 8 Lithostratigraphic correlation between Loc. 8, with its three closely spaced sections (see inset for geographic positions), and Loc. 6, which is the type section of the Hog's Back Formation ( Salad Hersi and Dix 1997 ). Correlative beds between Loc. 8 and 6 occur only above a single bed
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A) Disrupted sandstone and siltstone beds in the lower Rockcliffe red-bed (S1b) facies, Loc. 1. The interval of disruption is capped by a planar erosional surface (upper arrow) overlain by siltstone. The lower arrow points to a near-horizontal continuous base of sandstone overlying horizontally bedded strata. Coin (above erosional surface) is 2 cm in diameter. B) Deformed bedding (arrows) of the uppermost skeletal limestone in the Hog's Back Formation at Loc. 6, and only ∼ 20 cm beneath the Pamelia Formation.

A) Disrupted sandstone and siltstone beds in the lower Rockcliffe red-bed ... Available to Purchase

Published: 01 June 2013
horizontally bedded strata. Coin (above erosional surface) is 2 cm in diameter. B) Deformed bedding (arrows) of the uppermost skeletal limestone in the Hog's Back Formation at Loc. 6, and only ∼ 20 cm beneath the Pamelia Formation.
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Two possible correlations of Pamelia Formation between the Ottawa and Montréal regions. The thickness of the formation is significantly reduced toward Montréal and dominated by shale and dolostone. These lateral changes result either from a progressive eastward onlap such that the shale and dolostone facies at St. Vincent de Paul quarry (near Montréal) are time-equivalent with the uppermost unit (VI) of the formation in the Ottawa Embayment (a), or the thinner section at Montreal is a condensed section equivalent to the entire Pamelia Formation in the embayment (b). HB, Hog’s Back Formation; Bob, Bobcaygeon Formation See Fig. 11 for lithologic patterns.

Two possible correlations of Pamelia Formation between the Ottawa and Montr... Available to Purchase

Published: 01 March 2000
and dolostone facies at St. Vincent de Paul quarry (near Montréal) are time-equivalent with the uppermost unit (VI) of the formation in the Ottawa Embayment ( a ), or the thinner section at Montreal is a condensed section equivalent to the entire Pamelia Formation in the embayment ( b ). HB, Hog’s Back
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Details of the disconformity-bounded Rockcliffe strata at Loc. 8a (see Fig. 8). A) Two intervals (1 and 2) of facies S4 bracket an interval of facies S1a in which are two intervals (a and b) of enrolled bedding separated by an undulating sloping shale lamina (lower arrow) that defines either an erosional surface or a low-angle thrust fault. Length of measuring stick is ∼ 50 cm. B) Isolated bodies (a and b) of enrolled sediment of facies S1a in similar host strata. The left body displays a planar erosional upper boundary (black arrow) beneath a thin shale lamina and sandstone. Laminations of coarser-grained sediment of facies S4 (c) downlap onto the surface of a paleodepression (marked by white arrows) eroded into facies S1a, and are overlain abruptly by shale of the Hog's Back Formation (d).

Details of the disconformity-bounded Rockcliffe strata at Loc. 8a (see Fig... Available to Purchase

Published: 01 June 2013
. Laminations of coarser-grained sediment of facies S4 (c) downlap onto the surface of a paleodepression (marked by white arrows) eroded into facies S1a, and are overlain abruptly by shale of the Hog's Back Formation (d).
Journal Article

Geology and Age of some Plutons in North-Central Gaspe, Canada Free

H. S. de Römer
Published: 01 April 1974
Canadian Journal of Earth Sciences (1974) 11 (4): 570–582.
DOI: https://doi.org/10.1139/e74-052
...H. S. de Römer Abstract North-central Gaspe is characterized by three conspicuous leucocratic stocks intruded into Cambro-Ordovician and Siluro-Devonian formations: Monts McGerrigle, Hog's Back, and Mont Vallieres-de-St, Real. The Monts McGerrigle pluton, the largest of these, is a discordant...
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(a) Outcrop at Prince of Wales Falls, Ottawa (loc. 13). Normal fault (black arrows and intervening line) divides the outcrop into two blocks of which the northern block (lower part of the photo) displays the contact between the Rockcliffe (R) and the Hog’s Back (H) formations (lower, white dashed line), whereas the upper block shows the Hog’s Back (H) – Pamelia (P) formational contact (upper, white dashed line). The vertical white line indicates the section shown in Fig. 6b. (b) Unit I of the Pamelia Formation is characterized by interbedded sandstone (thick beds at the bottom and top of the photo), shale and limestone facies. The hammer is 25 cm long. (c) Erosional contact between the lower and upper members of the Pamelia Formation; loc. 25. The disconformity is better developed in the southeastern part of the Embayment (loc. 22, 25, and 28). The hammer is 33 cm long. (d) Dolostone and limestone interbeds of the Pamelia Formation (loc. 25). Lighter units, 1 and 2, are the dolostone lithofacies of T-1 and T-2, respectively. The sandstone facies of unit III (or T-3) lies in the upper part of the photo (3). Upper most dark and light grey interbeds represent the lower part of the limestone and dolostone interbeds of unit IV. The section is 15 m high.

( a ) Outcrop at Prince of Wales Falls, Ottawa (loc. 13). Normal fault (bla... Available to Purchase

Published: 01 March 2000
Fig. 6. ( a ) Outcrop at Prince of Wales Falls, Ottawa (loc. 13). Normal fault (black arrows and intervening line) divides the outcrop into two blocks of which the northern block (lower part of the photo) displays the contact between the Rockcliffe (R) and the Hog’s Back (H) formations (lower
Journal Article

ZION NATIONAL MONUMENT, UTAH Available to Purchase

HERBERT E WILLIAMS, NORMAN C GREGORY
Journal: GSA Bulletin
Published: 01 March 1947
GSA Bulletin (1947) 58 (3): 211–244.
DOI: https://doi.org/10.1130/0016-7606(1947)58[211:ZNMU]2.0.CO;2
... of erosion are outlined, each initiated by faulting accompanied by regional uplifts. Conspicuous erosion features are deep, vertically walled canyons, remnant flat lands, surfaces cut across tilted rocks, hog-backs, and thick accumulations of gravel on canyon floors, now in process of vigorous removal...
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Journal Article

Blackriveran (lower Mohawkian, Upper Ordovician) lithostratigraphy, rhythmicity, and paleogeography: Ottawa Embayment, eastern Ontario, Canada Available to Purchase

O. Salad Hersi, G.R. Dix
Published: 01 March 2000
Canadian Journal of Earth Sciences (2000) 36 (12): 2033–2050.
DOI: https://doi.org/10.1139/e99-087
... and dolostone facies at St. Vincent de Paul quarry (near Montréal) are time-equivalent with the uppermost unit (VI) of the formation in the Ottawa Embayment ( a ), or the thinner section at Montreal is a condensed section equivalent to the entire Pamelia Formation in the embayment ( b ). HB, Hog’s Back...
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View PDF for article title, Blackriveran (lower Mohawkian, Upper Ordovician) lithostratigraphy, rhythmicity, and paleogeography: Ottawa Embayment, eastern Ontario, Canada
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Journal Article

Geophysical evidence concerning the southern boundary of the London Platform beneath the Hog’s Back, Surrey Available to Purchase

S. Smalley, G. K. Westbrook
Published: 01 April 1982
Journal of the Geological Society (1982) 139 (2): 139–146.
DOI: https://doi.org/10.1144/gsjgs.139.2.0139
...S. Smalley; G. K. Westbrook Abstract The results of a gravity survey have been interpreted with seismic reflection and borehole data to show that a major change in the structure of the upper crust underlies the Hog’s Back W of Guildford, Surrey. The pre-Mesozoic basement beneath the thin Mesozoic...
View PDF for article title, Geophysical evidence concerning the southern boundary of the London Platform beneath the <span class="search-highlight">Hog’s</span> <span class="search-highlight">Back</span>, Surrey
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Journal Article

Ti-free högbomite in spinel- and sapphirine-bearing Mg-Al rock from the Palghat-Cauvery shear zone system, southern India Available to Purchase

T. Tsunogae, M. Santosh
Published: 01 December 2005
Mineralogical Magazine (2005) 69 (6): 937–949.
DOI: https://doi.org/10.1180/0026461056960300
...; low-Mg (and high-Al) högbomite (Hog-1; X Mg = 0.54–0.57) is greyish in a back scattered image, while the Mg-rich (and low-Al) variety (Hog-2; X Mg = 0.61–0.73) is dark greyish. Occasionally, high-Mg högbomite (Hog-3; X Mg =0.77–0.79) occurs associated with Hog-2. In spite...
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A, B) Two alternate stratigraphic correlations of the uppermost Carillon–lowermost Pamelia formation succession along a ∼ 15-km wireline (gamma-ray) transect. See inset map (Fig. 2) for section spacing and location. Detailed lithologic section (inset box) for core from Loc. 9 is compared to the gamma-ray log at this same site. See Table 1 for facies designations. Units a to d are highlighted to emphasize lateral patterns of intraformational (Rockcliffe, Hog's Back) stratigraphy; horizontal black bars refer to additional levels of pebbly sandstone to gravel conglomerate; and numbered thick black lines identify interpreted faults to accommodate offset gamma-ray expressions. The datum for Section A is a shale unit that overlies a local coarse-grained facies that is traced (lowermost shaded unit) by twin gamma-ray peaks. This body of sediment is restricted to an apparent small-scale graben developed on the Carillon paleoplatform. Units c and d appear restricted to shallow depressions on the Rockcliffe paleosurface that may be either depositional troughs (Fig. 9A) or local fault-bound depressions (Fig. 9B). Datum for Section B is the base of a regional (80+ km long) stromatolitic biostromal interval in the lower Pamelia Formation (see Fig. 7). In this interpretation, the basal conglomerate drapes over a small-scale horst, likely an artifact created by local erosion of the Carillon Formation, whereas units c and d remain restricted to fault-controlled depressions on the Rockcliffe paleosurface.

A , B) Two alternate stratigraphic correlations of the uppermost Carillon... Available to Purchase

Published: 01 June 2013
is compared to the gamma-ray log at this same site. See Table 1 for facies designations. Units a to d are highlighted to emphasize lateral patterns of intraformational (Rockcliffe, Hog's Back) stratigraphy; horizontal black bars refer to additional levels of pebbly sandstone to gravel conglomerate
Journal Article

The earthquake of April 21, 1918, in the San Jacinto Mountains Available to Purchase

Frank Rolfe, A. M. Strong
Published: 01 June 1918
Bulletin of the Seismological Society of America (1918) 8 (2-3): 63–67.
DOI: https://doi.org/10.1785/BSSA0080020063
... one and one-half miles to the east of the ranch house. The formation here is soft sandstone and shale, probably deposited in shallow lakes or possibly old valley fills, and the effect of the shock in cracking and generally shaking up the ground is very noticeable. This locality had been examined...
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Section 8. Cornbread and the Deacon Available to Purchase

Wally Broecker
Published: 01 April 2012
Geochemical Perspectives (2012) 1 (2): 244–248.
... experience a navigation problem. Our traverse from Fraser’s Hog Key back across the bank took about a day and a half and the return trip another day and a half. During this time we saw no land, so we had only a rough idea where we were. At our slow pace, tidal currents distorted any estimates we made...
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Gold Exploration and Potential of the Appalachian Piedmont of Eastern Alabama Available to Purchase

Jim Saunders, Mark Steltenpohl, Robert B. Cook
Journal: SEG Discovery
Published: 01 July 2013
SEG Discovery (2013) (94): 1–17.
DOI: https://doi.org/10.5382/SEGnews.2013-94.fea
... district consists of northeasterly trending gold occurrences and is located in northern Tallapoosa County, Alabama ( Fig. 2 ). The Hog Mountain deposit was discovered in 1839, and became the largest gold producer both in the district and in Alabama (~25,000 oz; Pardee and Park, 1948 ). The Goldville...
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