(PDF) Depositional environments of Quaternary lacustrine ...

Intraclastic limestone lenses represent quieter deposition in the interchannel areas of the lacustrine margin. Early lithification of the mud and erosion by fluvial action and lacustrine littoral reworking caused intraclast formation. Extraclasts were carried by the Las Peladas stream. ...

Precambrian Non-Marine Stromatolites

2009-6-5 · Lenses of intraclastic limestone, predominantly composed of stromatolite and/or oolite fragments, are nterbedded with the stromatolites (Fig. SC). Voids between the clasts commonly are partially filled with geopetal accumulations of IOgm anhedral calcite, probably recrystallized micrite. Accumulations of

Carbonate platform dominated by peloidal sands: Lower ...

In the middle member, anomalous lenses of intraclastic rudstone and laminated dolostone occur as graded beds overlying sharply downcut scoured surfaces up to 20 cm deep; these are interpreted to indicate a phase when accretion was punctuated occasionally by tsunamis generated from rift‐faulting seaward of the platform margin.

Climbing ripple structure and associated storm …

2019-4-9 · MulugSubgroup Rajaram Formation (735m) Calcareous sandstone with lenses of sandy limestone, intraclastic limestone, limestone and dolomite interbedded with green calcareous shale Bank-lagoon Ramgundam Sandstone (120m) Arkosic and subarkosic sandstone with interbedded shale Intertidal bar-shoal Jakaram Conglomerate (90m) Conglomerate, pebbly ...

DAKOTA COUNTY, MINNESOTA BEDROCK GEOLOGY OF …

2016-5-18 · Lenses and layers of light gray, finely crystalline, sandy ... and contains thin intraclastic zones. It is underlain by the Tomah Member, ... thin-bedded limestone. There is a thin bed of sandy, phosphatic dolostone at the base of the formation. Glenwood Formation—The Glenwood Formation is grayish-green to brownish-gray,

FACIES ANALYSIS OF THE OLIGOCENE SUCCESSION IN …

two conglomerate beds and fossiliferous limestone beds in the Sangaw area (40 Km from present study area), which he thought to be of Oligocene age. Ameen (2009) referred to the presence of Oligocene rocks in the same area, and in different parts of Kurdistan, northeast Iraq, but …

Sedimentology of the Psammo-pelitic-carbonate Unit ...

In the Paranoá Group, small limestone and dolomite lenses are found in the highest areas, whereas pelites were deposited in depressions and psammites inplatform ... (intraclastic floatstones and packstones) and, in small pro-portion, carbonates with ooids (oncolites and oolites).

NB Department of Natural Resources and Energy …

The Gays River rocks here occupy the southern slope of a prominent northeast trending ridge forming a band up to 300 m wide. In the quarry the limestone is comprised primarily of a light grey to pinkish grey, thick to massive, even to wavy bedded, intraclastic wackestone with subsidiary thin to medium thick beds and lenses of algal boundstone.

Work Shag

2018-8-24 · limestone contact (the C-4 showing), soil sampling over the ... laminae, stylolites, and intraclastic zones are common. The upper contact is marked by a pronounced transgression. ... zebroid beds and lenses, coarsely recrystallized pockets and white calcite masses. Cyclic Dolostone (CS): In places a prominantly ...

Characteristics, distribution and diagenetic stages of ...

and lenses) and limestone distinguishes the Río Blanco ... Facies 3: Intraclastic rudstone This flat-pebble conglomerate facies consists of sub-angular to rounded intraclasts composed of lime mud- ... meter-scale lenses about 10–50 cm thick. This is the coarsest facies in the La Silla Forma-

Onset and demise of Cretaceous oceanic anoxic events: The ...

2016-5-23 · Concentrations and/or alignments of large foraminifera and/or, more rarely, intraclasts to form flat lenses or laminae of packstone/wackestone and float stones, frequently embedded with abrupt base within the C2/D2 facies. Foraminiferal-intraclastic lags, generated by the removal by winnowing of the fine fraction under oxygenated conditions. G1 ...

From palaeosols to carbonate mounds: facies and ...

ded limestone, consisting of open-marine facies and biostromes. ... with M3 or M4, in the form of metric lenses in bioclastic sedi-ment. This microbial facies also developed in some large ... The M6 facies is characterised by its intraclastic character, the abundance of dendroid stromatoporoids and the dominant grainstone texture. It ...

Research paper Significance of Middle Cambrian mixed ...

2006-12-20 · correlated the Swasey Limestone below the Wheeler Formation to the Step Ridge Member of the Highland Peak Formation (Fig. 2). ... and rare intraclastic packstone lenses and desiccation features. Desiccation ... Intraclastic breccia at the base of the "mixed unit" in the

Unusual intraclastic limestones in Lower Triassic ...

1999-4-1 · Read "Unusual intraclastic limestones in Lower Triassic carbonates and their bearing on the aftermath of the end‐Permian mass extinction, Sedimentology" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

A Late Cretaceous epeiric carbonate platform: the Haftoman ...

2018-2-14 · Up-section, the succession is characterized by a meter-scale intercalation comprising dolomitic marlstone, dolomite with lenses of pebbles, (sandy/intraclastic) limestone, and reddish sandstone. Locally, lamination, current ripples, trough cross-bedding, and weak bioturbation including Ophiomorpha and small Thalassinoides have been observed ...

(PDF) Depositional environments of Quaternary lacustrine ...

Intraclastic limestone lenses. represent quieter deposition in the interchannel areas of the. lacustrine margin. Early lithification of the mud and erosion.

Fossilworks: Gateway to the Paleobiology Database

Lenses of bioclastic-intraclastic rudstone, with grain-types characteristic of both the barrier-top and lagoon, are interpreted as storm washover deposits. (Kiernan & Dix 2002. The Hull Limestone (Upper Ordovician) of Eastern Ontario: A Lower Paleozoic Carbonate Barrier-and …

(PDF) Depositional environments of Quaternary lacustrine ...

2009-6-5 · Lenses of intraclastic limestone, predominantly composed of stromatolite and/or oolite fragments, are nterbedded with the stromatolites (Fig. SC). Voids between the clasts commonly are partially filled with geopetal accumulations of IOgm anhedral calcite, probably recrystallized micrite. Accumulations of

KGS--OFR 94-23--Tuttle Creek Lake Spillway Exposure

2021-1-10 · Intraclastic limestone Angular to rounded micrite clasts throughout bed--become smaller and more rounded upward Increase in skeletal component upward--fusulinids, coated grains, small gastropods, and unident. brachiopod and bivalve debris Pyrite …

Mining Proposal Page 8

2021-1-4 · shallow dipping stratabound lenses within dolomitic intraclastic and tectonic breccias of the Burt Range Formation. The lenses average 7-10m in thickness, are generally less than 1km long and are 100m-500m wide. There is some structural control to the mineralisation, with higher grade zones associated with faulting.

Cenozoic pisolitic limestones of Pima and Cochise …

2020-4-2 · Formation limestone. ... 12. Lenses of Extreme Silicification ..... 41 13. Spheroidal Structures on Weathered Surface, ... 16. Intraclastic Nucleus Coated with Discontinuous, Crenulate Laminations ..... 48 Figure Page vi. vii LIST OF ILLUSTRATIONS— Continued Figure Page 17. Pisolite Exhibiting Elongation of Discontinuous, ...

Sedimentary context and palaeoecology of …

The genus Gigantoproductus contains the largest brachiopod specimens ever recorded (Muir-Wood & Cooper 1960) and these most commonly occur in shell beds or lenses (Ferguson 1978; Angiolini et al. 2012; Yao et al. 2016). Gigantoproductus is distinguished by its large size, shallow corpus cavity, irregular ribbing and fluting, and the occurrence of dorsal brachial cones (Pattison 1981; Brunton ...

Geology of Organ Mountains and southern San Andres ...

2021-1-19 · intraclastic, uneven porcellenite, calcitic, fissile intraclastíc. disturbed. skel. slightly sandy porcellanite. fissile skel. frag., Sand stringers 250 2400 230 E 2200 2100 200 c 19 180 - Capallero 5,000'' 4.000'' 3,000'' 2,000'' NORTH Kds / Ttrb NORTH intraclastic porcellanite, disturbed intraclastic sand stringers wavy bedding intractastic

Microfacies and microfossils in Upper Jurassic limestones ...

2020-10-13 · limestone surrounded by a red matrix (Pl. I). They show a lens-type geometry, a reduced lateral continuity – meters or tens of meters, and decimetric-centimetric thickness. The blocks are arranged chaotically, no sorting is evident, while the clasts of various size are rounded to angular. The matrix is a mixture of fine-

SIGEP

2011-3-4 · At the top of the unit, lenses of intraclastic and oolithic limestone may be observed in the São Miguel River, immediately below the basal Paranoá Group conglomerate. This carbonate facies is associated to regressive events related to the …

LOWER PALEOZOIC CARBONATE ROCKS OF THE …

2019-9-27 · Member, a clean, light-grey to off-white limestone, 10 m thick, that comprises intraclastic grainstone and skeletal mudstones containing ostracodes and gastropods. The Costa Bay Member is conformably overlain by the Aguathuna Formation. The base of the formation is locally marked by a stromatolitic limestone bed, a basal marker also 123

GeoUnitDesc

Geologic Unit Descriptions. The table below lists the geologic units and descriptions (from the map by Page, VanSistine, and Turner, 2005 for the U.S.-Mexico Border Environmental Health Project (BEHP) study area. Although the list is generally ordered according to increasing age, the listing should not be used to infer stratigraphy.

Geolex — Davenport publications

2020-8-7 · The limestones are partly laminated, pelletal, oolitic, intraclastic, and have birdseye fabric. Usually unfossiliferous. Some ostracodes, burrows, and stromatolites. Scattered shale partings and lenses. Extensively brecciated. Breccias have angular clasts and blocks of carbonate in a matrix of limestone or dolomite.