Wooster's Pseudofossils of the Week: Cone-in …
These are cone-in-cone structures, not shatter cones. This sample was undoubtedly collected from the Ohio Shale, which contains thin cone-in-cone limestone beds throughout its outcrop in Ohio. True …
Cone-in-cone structures: A new investigation
Cone-in-cone structures were chosen for this work mainly for the reasons that they exhibit a character which would suggest a compressive origin, on a scale small enough to study in hand-spechnen, and that from previous descriptions of their morphology, they would appear to be inconsistent with the results of the photoclastic study. ...
Freshwater stromatolites with the cone-in-cone structure …
It is discovered that cone-in-cone structure develops radially around the calcareous concretions, with conical apex pointing straight to the concretion center; the major mineral composition of ...
A genetic link between synsedimentary tectonics-expelled fluids
General considerations about cone-in-cone structures. Carbonate cone-in-cone (CIC) structures are a minor sedimentary structure in calcareous layers within shales and in the outer parts of septaria-type concretions; CIC resembles a set of concentric, right circular cones fitting one into another in inverted positions (base …
The Cone-in-Cone Structure and Its Origin
LITHOLOGY AND MINERAL RESOURCES Vol. 37 No. 6 2002 THE CONE-IN-CONE STRUCTURE AND ITS ORIGIN 525 euhedral and irregularly shaped crystals (0.01– 0.05 mm) of authigenic albite as well.
Bedding-parallel fibrous veins (beef and cone-in-cone): …
The term "beef" refers to bedding-parallel veins of fibrous minerals, where the fibres are mutually parallel and have formed quasi-vertically. More complex on a …
The shatter cone page
In impact structures, the size of the cones is between centimeters and meters. Fully developed cones are rare which is explained by rock inhomogeneities. In the extreme, shatter cones may degenerate into shatter cleavage (in slaty rocks). Fig. 2. Shatter cone negative fracture markings showing strongly varying orientation. Kentland impact crater.
Silicified Cone-in-Cone Structures from Erfoud (Morocco): …
Important differences include: (1) Shatter cone striations are of distinctly roundish shape, whereas cone-in-cone striae are step-like; (2) shatter cones never show scaled surfaces; (3) broken cone-in-cone structures invariably produce one surface with striated cone features, but its opposite side would display scaled cone cups; (4) shatter ...
Cone-in-cone structures: A new investigation
Cone-in-cone structure is observed in the Kosho Alternation Member of the Itsukmachi Group (Miocene) exposed along the Akigawa River in Akiruno City, Tokyo. This sedimentary structure has long … Expand. PDF. Save. Origin of spherulitic and cone-in-cone concretions in Cambro-Ordovician black shales, St Lawrence Estuary, Quebec, …
Diagenetic structures
Cone-in-cone structures consist of nested cones of authigenic minerals, most commonly calcite, that are separated from one another by thin films of clay. They …
On some examples of Cone-in-Cone Structure
On some examples of Cone-in-Cone Structure - Volume 10 Issue 46. To save this article to your Kindle, first ensure coreplatform@cambridge is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account.
Cone-in-cone structure: New data
Becq-Giraudon J.F. (1990) Cone in cone structure in an environment of siliciclastic deposition. New observation on Lower Ordovician cone-in-cone structures of the Montagne Noire, south French Massif central. Geologie de la France, (2), 11-19. 5. Boggs S. (2005) Principles of Sedimentology and Stratigraphy. Upper Saddle River, N.J.: …
A genetic link between synsedimentary tectonics-expelled fluids
Section snippets General considerations about cone-in-cone structures. Carbonate cone-in-cone (CIC) structures are a minor sedimentary structure in calcareous layers within shales and in the outer parts of septaria-type concretions; CIC resembles a set of concentric, right circular cones fitting one into another in inverted …
Cone | plant anatomy | Britannica
Cone, in botany, mass of scales or bracts, usually ovate in shape, containing the reproductive organs of certain nonflowering plants. The cone, a distinguishing feature of pines and other conifers, is also found on all gymnosperms, on some club mosses, and on
New insights in the origin of cone-in-cone structures
Previous theories on cone-in-cone structure origin have failed to explain some of its features, such as the absence of cone-in-cone in veins other than horizontal and the cross-cutting relations of conical surfaces to detritical clay films. They have neither taken in account the importance of pore pressures in the process of growth of veins and …
Cone-in-cone structures: A new investigation
Some nodules exhibit cone-in-cone structures on their lower face. We studied such nodules using various techniques of imaging and chemical (major and trace-elements) and isotopic analyses (C carb, C org, O and S stable isotopes). We interpret the cone-in-cone to be the end product of carbonate-nodule formation during early diagenesis.
Dolomite overgrowths suggest a primary origin of …
A calcite deposit from the Cretaceous of Jordan bears all the defining characteristics of the structure. Trace dolomite within the sample supports the primary cone-in-cone hypothesis. The host …
Probing the tunable multi-cone band structure in Bernal …
This goes along with drastic changes of the band structure: the center cone diminishes whereas the three off-center cones (Fig. 3a, b) with however a parabolic dispersion remain, which we ...
Dolomite overgrowths suggest a primary origin of cone-in-cone
A long-debated aspect of cone-in-cone structures is whether the mineral aggregates composing the structure precipitated with their conical form (primary cone-in-cone), or whether the cones formed after precipitation (secondary cone-in-cone). A calcite deposit from the Cretaceous of Jordan bears all the defining characteristics of the structure.
CONE-IN-CONESTRUCTURE IN THE OHIO SHaLE OF ERIE …
cones are on the undersides of layers they are smaller and have bases downward, (4) sharp blows with a hammer on fibrous calcite produce percussion cones that approximate cone-in-cone,(5) solution and re arrangement of fibers are present along minor faults that cut the fibers, (6) slickensided phenomena are present between the cones, and (7) solu
A Note on Cone-in-Cone Structure | Mineralogical …
The structure called cone-in-cone attracted my attention when I was working at certain forms of jointing and spherulitic structures in rocks, and has been studied in a desultoiy fashion ever since. Moreover, the Museum of University College possesses some good specimens of cone in-cone obtained by the late Prof. Morris, …
Cone-in-Cone Structure | Geological Magazine | Cambridge Core
Bedding-parallel fibrous veins (beef and cone-in-cone): Worldwide occurrence and possible significance in terms of fluid overpressure, hydrocarbon generation and mineralization. Marine and Petroleum Geology, Vol. 43, Issue., p. 1.
Diagenetic structures
Cone-in-cone structures consist of nested cones of authigenic minerals, most commonly calcite, that are separated from one another by thin films of clay. They occur mainly in shales, but have also been reported in argillaceous sandstones. Numerous explanations have been put forth to explain these structures, with the most popular …
Photoreceptors: Rods and cones
Cones. Cone cells have cone-shaped outer segments that are short with membrane folds creating sacs that contain three photopigments, collectively known as iodopsins.Similar to rhodospins, they comprise two components: a subgroup of the opsin family known as photopsins which hold the chromophore retinal in place. There are …
cone-in-cone structure
cone-in-cone structure A secondary sedimentary structure consisting of small cones nested one inside another and most commonly made from calcium carbonate. They are believed to form by the growth of fibrous crystals in the sediment while this is still plastic. Source for information on cone-in-cone structure: A Dictionary of Earth Sciences …
20. CONE-IN-CONE AND BEEF-IN-SHALE TEXTURES …
The best developed cone-in-cone structures occur in Core Section 330-5-1. Figure 1 shows a section across one side of a major cone structure with an apical angle close to 60°. The prominent partings separating in-dividual cones are filled with soft clay, but thinner clay partings mark smaller parasitic cones. Ribbing features
Cone cell
Cone cells, or cones, are one of the two types of photoreceptor cells that are in the retina of the eye which are responsible for color vision as well as eye color sensitivity; they function best in relatively bright light, as opposed to rod cells that work better in dim light. Cone cells are densely packed in the fovea centralis a 0.3 mm diameter rod-free area with very thin, …
Cone-in-Cone Structure
Large fossils were found of the Rhinoceros, the Horse, the Buffalo, the Antelope, and of several carnivorous animals; the group of fossil faunas as a whole involving the condition that a plateau in the Himalayan Mountains had then such a climate as enabled the Ehinoceros and several subtropical forms to exist. semitropical genus, and there is no …
Freshwater stromatolites with the cone-in-cone structure …
Morphological features of the columnar-stratiform stromatolites, which resemble the cone-in-cone structure, from Neogene lacustrine sediments of northern Vietnam are analyzed. Their structural-textural peculiarities and interrelations with the host terrigenous sediments of a stromatolitic buildup are discussed. It is shown that stages of …
CONE-IN-CONE STRUCTURES
Cone-in-cone structures are strange features found as interbeds in fine-grained siliciclastic rocks and sometimes found in the outer layers of concretions. They consists of sets of conical structures stacked up …