Compositional and Geochemical Signatures for the Sedimentary Evolution of the Middle Triassic–Lower Jurassic Continental Redbeds from Western-Central Mediterranean Alpine Chains

Compositional and chemical analyses suggest that Middle Triassic–Lower Liassic continental redbeds (in the internal domains of the Betic, Maghrebian, and Apenninic chains) can be considered a regional lithosome marking the Triassic-Jurassic rift-valley stage of Tethyan rifting, which led to the Pangaea breakup and subsequent development of a mosaic of plates and microplates. Sandstones are quartzose to quartzolithic and represent a provenance of continental block and recycled orogen, made up mainly of Paleozoic metasedimentary rocks similar to those underlying the redbeds. Mudrocks display K enrichments; intense paleoweathering under a hot, episodically humid climate with a prolonged dry season; and sediment recycling. Redbeds experienced temperatures in the range of 100°–160°C and lithostatic/tectonic loading of more than 4 km. These redbeds represent an important stratigraphic signature to reconstruct a continental block (Mesomediterranean Microplate) that separated different realms of the western Tethys from Middle-Late Jurassic to Miocene, when it was completely involved in Alpine orogenesis.

Contramedidas en la suplantación de autoridades de certificación. Certificate pinning

La importancia de asegurar la comunicación entre personas ha crecido a medida que se ha avanzado en la sofisticación y el alcance de los mecanismos provistos para ello. Ahora, en la era digital, el alcance de estas comunicaciones es global y surge la necesidad de confiar en infraestructuras que suplan la imposibilidad de identificar a ambos extremos de la comunicación. Es la infraestructura de autoridades de certificación y la gestión correcta de certificados digitales la que ha facilitado una aproximación más eficiente para cubrir esta demanda. Existen, sin embargo, algunos aspectos de esta infraestructura o de la implementación de algunos de sus mecanismos que pueden ser aprovechados para vulnerar la seguridad que su uso debe garantizar. La presente investigación profundiza en alguno de estos aspectos y analiza la validez de las soluciones propuestas por grandes productores de software frente a escenarios realistas.

Compositional signatures of the Cenozoic sedimentary succesions of the Malaguide Complex (Betic Cordillera, Spain)

The studied Cenozoic sedimentary successions consist of deposits from continental/shallow-water to deep-marine environments of the Malaguide Complex (Betic Cordillera) outcropping in the Sierra Espuña area (SE Spain). The aim of this study is to characterize the composition, source area(s) provenance and weathering processes of these sedimentary successions from the pre-orogenic (Paleocene-Early Oligocene) to the syn-orogenic (Late Oligocene-Early Miocene) stage using petrological and geochemical methodologies. The studied sandstones are mainly quartzolithic with abundant metamorphic and sedimentary lithic fragments. In particular, the composition of samples from the pre-orogenic cycle is mainly carbonate with important siliciclastic components that occur within the medium to fine grained arenites. The composition of samples from the syn-orogenic cycle is characterized by a sharp change from carbonate to siliciclastic terms. Thus, the composition of the overall sandstone samples is very heterogeneous and suggests a source area mainly characterized by the Malaguide basement and lower units of the Internal Betic Zone, that partially compose the Mesomediterranean Microplate. The geochemical proxies suggest a provenance mainly from felsic source area with a minor supply from mafic rocks in some samples of the syn-orogenic stage. Furthermore, palaeoweathering indices indicate low to moderate weathering conditions for the sources. The Cenozoic sedimentary successions of the Malaguide Complex played an important role in the geodynamic evolution of the Betic Cordillera that represents the key tectonic element of the western domains of the Mesomediterranean Microplate.

"Certificate respecting the Rev. John Seccombe," 1795 August

One leaf (pages 301-302) of the August, 1795 issue of Massachusetts Magazine with an editorial regarding the authorship of Father Abbey's Will. The article identifies John Seccombe as the author based on information provided by "Thaddeus Mason, Esq. of Cambridge, the only surviving classmate, and very intimate friend of the Rev. John Seccombe."

Gauger's certificate, 1785 September 10

One-page handwritten document certifying Caleb Hayden was taught the art of gauging.

Certificate of the Selectmen of Boston, 1787 August 22

Two handwritten copies of a document certifying Croswell's employment as an usher in the Boston South Public Grammar School.

Certificate of parent, 1807 June 6

This brief handwritten note, signed by the parent of a Liverpool student, certifies Croswell's proficiency as an instructor.

Copyright certificate for the Celestial Planisphere, [1806] July 11

Handwritten copy of a certificate acknowledging the deposit of the title of Croswell's celestial planisphere with the clerk of the District of Massachusetts.

Certificate to John Walton, guardian to Nathaniel Jarvis, 1804 November 22

This brief handwritten document certifies that the guardianship of Richard Nichols of Reading, Massachusetts, was granted to yeoman Thomas Hartshorn of Reading according to the records of the Probate Court in Framingham, Massachusetts. The document is attested by James Winthrop in his capacity as register of probate for Middlesex County.

Certificate to Thomas Hartsorn, guardian of Richard Nichols, 1812 June 18

This brief handwritten document certifies that the guardianship of Nathaniel Jarvis of Cambridge, Massachusetts, was granted to John Walton of Cambridge according to the records of the Probate Office in Cambridge. The document is attested by James Winthrop in his capacity as register of probate for Middlesex County.

[Certificate of admission of Thomas B. Hall], 1840 August 27

Printed copy of an undated abstract of laws and regulations with the admittatur of undergraduate Thomas Bartlett Hall to the Sophomore class on probation signed by President Josiah Quincy on August 27, 1840. The admittatur identifies Hall as a sophomore.

[Certificate of admission of Justin Winsor], 1849 July 20

Printed copy of an undated abstract of laws and regulations with the admittatur of undergraduate Justin Winsor signed by President Jared Sparks on July 20, 1849.

[Certificate of admission of Charles Ammi Cutter], 1851 July 15

Photocopy of an abstract of laws and regulations, and the certificate of admission of undergraduate Charles Ammi Cutter signed by President Jared Sparks on July 15, 1851.

[Certificate of admission of Elihu Chauncey], 1857 September 4

Printed copy of an abstract of laws and regulations, and the certificate of admission of undergraduate Elihu Chauncey signed by President James Walker on September 4, 1857.

[Certificate of admission of W. P. Alexander], 1866 July 17

Printed copy of an abstract of laws and regulations, and the certificate of admission of undergraduate W. P. Alexander signed by President Thomas Hill on July 17, 1866.