Patterns of faunal change at an upper Cambrian trilobite extinction event, Nolichucky Formation, Tennessee and Virginia

During the Upper Cambrian there were three mass extinctions, each of which eliminated at least half of the trilobite families living in North American shelf seas. The Nolichucky Formation preserves the record of one of these extinction events at the base of the Steptoean Stage. Sixty-six trilobite collections were made from five sections In Tennessee and Virginia. The lower Steptoean faunas are assigned to one low diversity, Aphelaspis-dominated biofacies, which can be recognized in several other parts of North America. In Tennessee, the underlying upper Marjuman strata contain two higher diversity biofacies, the Coosella-Glaphyraspis Biofacies and the Tricrepicephalus-Norwoodiid Biofacies. At least four different biofacies are present in other parts of North America: the Crepicephalus -Lonchocephalus Biofacies, the Kingstonia Biofacies, the Cedaria Biofacies, and the Uncaspis Biofacies. A new, species-based zonation for the Nolichucky Formation imcludes five zones, three of which are new. These zones are the Crepicephalus Zone, the Coosella perplexa Zone, the Aphelaspis buttsi Zone, the A. walcotti Zone and the A. tarda Zone. The Nolichucky Formation was deposited within a shallow shelf basin and consists largely of subtidal shales with stormgenerated carbonate interbeds. A relative deepening is recorded In the Nolichucky Formation near the extinction, and is indicated In some sections by the appearance of shale-rich, distal storm deposits above a carbonate-rich, more proximal storm deposit sequence. A comparable deepening-upward sequence occurs near the extinction in the Great Basin of southwestern United States and in central Texas, and this suggests a possible eustatic control. In other parts of North America, the extinction IS recorded In a variety of environmental settings that range from near-shore to slope. In shelf environments, there is a marked decrease in diversity, and a sharp reduction in biofacies differentiation. Although extinctions do take place in slope environments, there IS no net reduction in diversity because of the immigration of several new taxa.

Woodmen of the World Convention: Souvenir of Niagara Falls. --

Presented with the compliments of Jubilee Camp 103.

Correspondence between the American and British Plentipotentiaries relative to the commercial convention concluded on the 3rd of July, 1815.--

January 16, 1816.

Message from the President of the United States, in relation to the claim of Virginia, an account of interest paid by that State, on moneys borrowed for the payment of the militia thereof, for services rendered the United States.--

April 13, 1824. Printed by order of the Senate of the United States.

Message from the President of the United States, transmitting copies of a convention concluded at St. Petersburg, the 12th day of July, 1822, under the mediation of the Emperor of all the Russias, between the United States of America and His Britannic Majesty. --

United States. 18th Congress, 1st session, 1823-1824. House. Doc. no. 30.

Independent Chronicle Vol. XLVI No. 3477- August 8, 1814

A semi-weekly paper that was published from 1801 to 1817. It was previously called the Independent chronicle and the universal advertiser, and was later the Independent chronicle and Boston patriot (Semiweekly). Publishers were Abijah Adams and Ebenezer Rhoades. Topics of interest in this issue include: Page 1: notice from the U.S. War Department seeking proposals for the supply of rations to troops; account of the battle of Bridgewater; list of important military figures wounded in the battle; news of prisoner exchange; Americans and the British negotiate and new prisoner exchange convention; Page 2: report of more British troops sailing to North America; report of some Indian tribes signing a treaty to fight against the British; report of battle near Detroit; report of militia moving from Fredricksburg, Virginia to Baltimore, Maryland; report of troop numbers and casualties in the battle of Bridgewater; report that Commodore Chauncey has recovered from his illness; news of American Naval forces sailing from Sackett's Harbor; Indian tribes sign peace treaty with U.S.; news of U.S. relations with Indians in the southern U.S.; account of battle of Bridgewater and list of casualties; report of the number of men killed and wounded on both sides in the battle of Chippewa; Page 3: report of surprise attack on the British; news of warship movements in and out of Halifax; frigate Java launched in Baltimore; news of British ship movements; 3 companies of Massachusetts militia arrive at Fort Warren; news of ship movements in and out of the Port of Boston; various Marshal's notices alleging U.S. ships supplying goods to the British;

Correspondence between the American and British Plentipotentiaries relative to the commercial convention concluded on the 3rd of July, 1815

January 16, 1816. Printed by order of the House of Representatives. 14th Congress, 1st Session, 1815-1816. House. At head of title: [27].

Message from the President of the United States, in relation to the claim of Virginia, an account of interest paid by that State, on moneys borrowed for the payment of the militia thereof, for services rendered the United States

April 13, 1824. Printed by order of the Senate of the United States. At head of title: 18th congress, 1st session. [64]. Printed by Cales and Seaton

Message from the President of the United States, transmitting copies of a convention concluded at St. Petersburg, the 12th day of July, 1822

Full Title: Message from the President of the United States, transmitting copies of a convention concluded at St. Petersburg, the 12th day of July, 1822, under the mediation of the Emperor of all the Russias, between the United States of America and His Britannic Majesty. United States. 18th Congress, 1st session, 1823-1824. House. Doc. no. 30. January 25, 1823. Read and referred to the Committee on Ways and Means. Printed by Gales and Seaton

Proceedings of the Convention of the State of New York ; held at the Capitol in the City of Albany, on the seventeenth and eighteenth days of September, 1812

Signed by Jacob Morris, President, and William Henderson, Secretary.

Análisis de la pesquería mexicana del atún aleta amarilla Thunnusalbacares (Bonaterre, 1788) en el Océano Pacífico Oriental, 1981-1990

Tesis (Maestría en Ciencias con Especialidad en Ecología Acuática y Pesca) UANL

Análisis de los factores de retardo de red que afectan el transporte de la voz sobre redes públicas de frame relay [por] María Virginia Flores González

Tesis (Maestría en Ciencias Computacionales con Especialidad en Teleinformática) U.A.N.L.