A stochastic control system /

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Automation of periodic reports. Preliminary user's manual.

Transportation Department, Office of the Assistant Secretary for Policy and International Affairs, Washington, D.C.

Proceedings : National Medevac Helicopter Conference /

Mode of access: Internet.

Location and ages of terrestrial peatlands located on continental shelves and in coastal sediments

This synthesis dataset contains records of freshwater peat and lake sediments from continental shelves and coastal areas. Information included is site location (when available), thickness and description of terrestrial sediments as well as underlying and overlying sediments, dates (when available), and references.

Revisiting the Late Jurassic-Early Cretaceous of the NW South Iberian Basin: new ages and sedimentary environments

The study of the Upper Jurassic-Lower Cretaceous deposits (Higueruelas, Villar del Arzobispo and Aldea de Cortés Formations) of the South Iberian Basin (NW Valencia, Spain) reveals new stratigraphic and sedimentological data, which have significant implications on the stratigraphic framework, depositional environments and age of these units. The Higueruelas Fm was deposited in a mid-inner carbonate platform where oncolitic bars migrated by the action of storms and where oncoid production progressively decreased towards the uppermost part of the unit. The overlying Villar del Arzobispo Fm has been traditionally interpreted as an inner platform-lagoon evolving into a tidal-flat. Here it is interpreted as an inner-carbonate platform affected by storms, where oolitic shoals protected a lagoon, which had siliciclastic inputs from the continent. The Aldea de Cortés Fm has been previously interpreted as a lagoon surrounded by tidal-flats and fluvial-deltaic plains. Here it is reinterpreted as a coastal wetland where siliciclastic muddy deposits interacted with shallow fresh to marine water bodies, aeolian dunes and continental siliciclastic inputs. The contact between the Higueruelas and Villar del Arzobispo Fms, classically defined as gradual, is also interpreted here as rapid. More importantly, the contact between the Villar del Arzobispo and Aldea de Cortés Fms, previously considered as unconformable, is here interpreted as gradual. The presence of Alveosepta in the Villar del Arzobispo Fm suggests that at least part of this unit is Kimmeridgian, unlike the previously assigned Late Tithonian-Middle Berriasian age. Consequently, the underlying Higueruelas Fm, previously considered Tithonian, should not be younger than Kimmeridgian. Accordingly, sedimentation of the Aldea de Cortés Fm, previously considered Valangian-Hauterivian, probably started during the Tithonian and it may be considered part of the regressive trend of the Late Jurassic-Early Cretaceous cycle. This is consistent with the dinosaur faunas, typically Jurassic, described in the Villar del Arzobispo and Aldea de Cortés Fms.

On the microstructure, growth pattern and original porosity of belemnite rostra: insights from calcitic Jurassic belemnites

Calcitic belemnite rostra are usually employed to perform paleoenvironmental studies based on geochemical data. However, several questions, such as their original porosity and microstructure, remain open, despite they are essential to make accurate interpretations based on geochemical analyses.This paper revisits and enlightens some of these questions. Petrographic data demonstrate that calcite crystals of the rostrum solidum of belemnites grow from spherulites that successively develop along the apical line, resulting in a “regular spherulithic prismatic” microstructure. Radially arranged calcite crystals emerge and diverge from the spherulites: towards the apex, crystals grow until a new spherulite is formed; towards the external walls of the rostrum, the crystals become progressively bigger and prismatic. Adjacent crystals slightly vary in their c-axis orientation, resulting in undulose extinction. Concentric growth layering develops at different scales and is superimposed and traversed by a radial pattern, which results in the micro-fibrous texture that is observed in the calcite crystals in the rostra.Petrographic data demonstrate that single calcite crystals in the rostra have a composite nature, which strongly suggests that the belemnite rostra were originally porous. Single crystals consistently comprise two distinct zones or sectors in optical continuity: 1) the inner zone is fluorescent, has relatively low optical relief under transmitted light (TL) microscopy, a dark-grey color under backscatter electron microscopy (BSEM), a commonly triangular shape, a “patchy” appearance and relatively high Mg and Na contents; 2) the outer sector is non-fluorescent, has relatively high optical relief under TL, a light-grey color under BSEM and low Mg and Na contents. The inner and fluorescent sectors are interpreted to have formed first as a product of biologically controlled mineralization during belemnite skeletal growth and the non-fluorescent outer sectors as overgrowths of the former, filling the intra- and inter-crystalline porosity. This question has important implications for making paleoenvironmental and/or paleoclimatic interpretations based on geochemical analyses of belemnite rostra.Finally, the petrographic features of composite calcite crystals in the rostra also suggest the non-classical crystallization of belemnite rostra, as previously suggested by other authors.

Kartta Suomen rautateistä 1917-vuoden lopulla Karta öfver järnvägarne i Finland vid utgången af år 1917

1 kartta :, vär. ;, 40,4 x 44,7 cm, lehti 46 x 50 cm, 1:2000000

El proceso electoral de 1917 en la provincia de Buenos Aires y el triunfo de la U.C.R.

El 24 de abril de 1917 se dictó el decreto de intervención federal a la provincia de Buenos Aires. Producido este hecho, las diversas fuerzas políticas se prepararon para participar en las elecciones de gobernador y legisladores que habr��an de realizarse en marzo de 1918, pero fue en el radicalismo donde el proceso habr��a de ser realmente complicado. Arribada la UCR al poder a través de la intervención y con claras perspectivas de llegar al gobierno, r��pidamente se pudo contemplar que, dentro de la misma y sin llegar a la ruptura, se formaron dos líneas claramente contrapuestas que se denominaron provincialistas, origen en parte del antipersonalismo provincial, y los metropolitanos. Luego de un arduo proceso, con activa participación de Yrigoyen, se llegó a dar consenso a la fórmula Crotto-Monteverde, que habr��a de imponerse sobre los conservadores y socialistas, pero que dejó abierto el camino para las fuertes luchas intrapartidarias del radicalismo

El proceso electoral de 1917 en la provincia de Buenos Aires y el triunfo de la U.C.R.

El 24 de abril de 1917 se dictó el decreto de intervención federal a la provincia de Buenos Aires. Producido este hecho, las diversas fuerzas políticas se prepararon para participar en las elecciones de gobernador y legisladores que habr��an de realizarse en marzo de 1918, pero fue en el radicalismo donde el proceso habr��a de ser realmente complicado. Arribada la UCR al poder a través de la intervención y con claras perspectivas de llegar al gobierno, r��pidamente se pudo contemplar que, dentro de la misma y sin llegar a la ruptura, se formaron dos líneas claramente contrapuestas que se denominaron provincialistas, origen en parte del antipersonalismo provincial, y los metropolitanos. Luego de un arduo proceso, con activa participación de Yrigoyen, se llegó a dar consenso a la fórmula Crotto-Monteverde, que habr��a de imponerse sobre los conservadores y socialistas, pero que dejó abierto el camino para las fuertes luchas intrapartidarias del radicalismo

El proceso electoral de 1917 en la provincia de Buenos Aires y el triunfo de la U.C.R.

El 24 de abril de 1917 se dictó el decreto de intervención federal a la provincia de Buenos Aires. Producido este hecho, las diversas fuerzas políticas se prepararon para participar en las elecciones de gobernador y legisladores que habr��an de realizarse en marzo de 1918, pero fue en el radicalismo donde el proceso habr��a de ser realmente complicado. Arribada la UCR al poder a través de la intervención y con claras perspectivas de llegar al gobierno, r��pidamente se pudo contemplar que, dentro de la misma y sin llegar a la ruptura, se formaron dos líneas claramente contrapuestas que se denominaron provincialistas, origen en parte del antipersonalismo provincial, y los metropolitanos. Luego de un arduo proceso, con activa participación de Yrigoyen, se llegó a dar consenso a la fórmula Crotto-Monteverde, que habr��a de imponerse sobre los conservadores y socialistas, pero que dejó abierto el camino para las fuertes luchas intrapartidarias del radicalismo