Noril'sk/Siberian plateau basalts and Bahama hot spot: Impact triggered?

Twenty-eight years after one of us argued that Sudbury was an astrobleme, this interpretation has only recently attained wide acceptance; not so for the view that the Sudbury Cu/Ni sulfide ores are cosmogenic. Other research has provided the triggering of plateau basalts by super-large impacts a modicum of respectability. The recent apparent successful tying in of the K/T extinctions to the Chicxulub astrobleme in the Yucatan encourages the search for an impact event that may have caused the other two major post-Paleozoic extinctions (P/Tr, Tr/J). This gives us heart to offer two further outrageous hypotheses. The cosmogenic concept for the Sudbury ore deposite remains viable because it is giant, nonultramafic, and unique (except for Noril'sk). The Triassic/Jurassic boundary catastrophic extinctions have been attributed to the Manicouagan asteroidal impact, but recent radiometric dating indicates these events are diachronous (Manicouagan astrobleme 212 +/- 2 Ma and Tr/J boundary 200 Ma)

Shatter cones in Illinois: Evidence for metoeritic impacts at Glasford and Des Plaines

Shatter cone fragments were recovered from rock cores at two previously suspected, but heretofore unverified, impact structures in Illinois. Both sites are buried features known from geophysical surveys and drill holes. Shatter cones are accepted widely as field criteria of meteoritic impact. Detection of these shock indicators in both the Glasford Structure and the Des Plains Disturbance upgrades these sites in Earth's inventory of known and suspected impact structures from possible impact sites with compatible structure and morphology to probable impact structures which possess also evidence of shock metamorphism

Shatter cones: Diagnostic impact signatures

Uniquely fractured target rocks known as shatter cones are associated with more than one half the world's 120 or so presently known impact structures. Shatter cones are a form of tensile rock failure in which a positive conical plug separates from a negative outer cup or mold and delicate ornaments radiating from an apex are preserved on surfaces of both portions. Although distinct, shatter cones are sometimes confused with other striated geologic features such as ventifacts, stylolites, cone-in-cone, slickensides, and artificial blast plumes. Complete cones or solitary cones are rare, occurrences are usually as swarms in thoroughly fractured rock. Shatter cones may form in a zone where an expanding shock wave propagating through a target decays to form an elastic wave. Near this transition zone, the expanding primary wave may strike a pebble or other inhomogeneity whose contrasting transmission properties produce a scattered secondary wave. Interference between primary and secondary scattered waves produce conical stress fields with axes perpendicular to the plane of an advancing shock front. This model supports mechanism capable of producing such shatter cone properties as orientation, apical clasts, lithic dependence, and shock pressure zonation. Although formational mechanics are still poorly understood, shatter cones have become the simplest geologic field criterion for recognizing astroblemes (ancient terrestrial impact structures)

Analysis of the Gran Desierto, Pinacte Region, Sonora, Mexico, via shuttle imaging radar

The radar discriminability of geolian features and their geological setting as imaged by the SIR-A experiment is examined. The Gran Desierto and Pincate volcanio field of Sonora, Mexico was used to analyze the radar characteristics of the interplay of aeolian features and volcano terrain. The area in the Gran Desierto covers 4000 sq. km. and contains sand dunes of several forms. The Pincate volcanio field covers more than 2.000 sq. km. and consists primarily of basaltic lavas. Margins of the field, especially on the western and northern sides, include several maar and maar-like craters; thus obtaining information on their radar characteristics for comparison with impact craters

UA37/30/1 Faculty Personal Papers Lowell Harrison Correspondence/Subject File

Correspondence and subject files created by Lowell Harrison

Sudbury Breccia and suevite as glacial indicators transported 800 km to Kentland Astrobleme, Indiana

A glacial erratic whose place of origin is known by direct comparison with bedrock is known as an indicator. In 1971, while visiting the known astrobleme at Kentland, Indiana, Peredery recognized and sampled in the overlying glacial drift deposits a distinctive boulder of Sudbury suevite (black member, Onaping Formation) that normally occurs within the Sudbury Basin as an impact fall-back or wash-in deposit. The rock was sampled (but later mislaid) from a farmer's cairn next to a cleared field. Informal reports of this discovery prompted the other authors to recently reconnoiter the Kentland locality in an attempt to relocate the original boulder. Several breccia blocks were sampled but laboratory examination proved most of these probably to be diamictites from the Precambrian Gowganda Formation, which outcrops extensively in the southern Ontario. However, one sample was confirmed as typical Sudbury Breccia, which outcrops in the country rock surrounding the Sudbury Basin. Thus two glacial indicators were transported by Pleistocene continental glaciers about 820 km over a tightly proscribed path and, curiously, from one astrobleme to another. Brecciated boulders in the Illinois/Indiana till plain are usually ascribed to the Gowganda or Mississagi formations in Ontario. But impact-generated rocks need not be confused. The carbonaceous matrix of the suevite, for example, was sufficiently distinctive to assign it to the upper portion of the black Onaping. The unique and restricted source area of these indicators provide an accurate and reliable control for estimating Pleistocene ice movement

Does Nighttime Television Influence Attitudes Toward Drinking?

Alcoholism is a problem in the United States. Television portrays individuals drinking alcohol. Is television influencing attitudes toward drinking? An experiment was performed with students from San Josè State University in the School of Journalism and Mass Communications to discover if television would indeed influence them to drink. Two groups, both Mass Communication classes, participated in an initial survey, and then the test group class viewed a dramatized program in which the main character was depicted drinking glamorously. Both classes then took the same survey again. Results were analyzed via a t-test. Although there was a change in attitude regarding two of the questions directly attributable to the program, the majority of the answers did not reflect any significant changes in attitude. The results of I feel that TV police detectives serve as positive role models (t (40) = -2.004, p = .046) showed a change as there was not as much support for TV police detectives in the initial survey. Regarding Which television character is most likely to drink alcohol (t (40) = 2.451, p = .009), the results were in favor of a businessman or businesswoman. Ironically the initial survey showed that the students thought that a police detective is most likely to drink

Queer Joy :)

Throughout this project I established a creative practice that encourages spreading joy and taking care of each other. My research focuses on my personal journey as a queer person, how people across the spectrum of identity can relate to my work, new materials and methods of working, and kissing boys and thinking about it really hard. My thesis is a collection of work that aims to share queer joy through illustration, design, videomaking, collaboration, and physical objects. I hope to share the relationship that I have with queerness and how queer liberation and acceptance can benefit all people

Blended Learning Integration: Student Motivation and Autonomy in a Blended Learning Environment

The purpose of this study was to analyze teacher perceptions on the relationship of technology and student academic behaviors and performance in the blended learning environment across 9th through 12th grade within east Tennessee and to identify the components of blended learning and pedagogical practices that enhance students’ academic behaviors. Specifically, this study is an analysis of how student motivation and student autonomy relate to technology implementation and face-to-face instruction within blended learning environments. The participants of this study were teachers within 2 school districts in East Tennessee. All high school teachers within the participating school districts received an online survey that was distributed from their corresponding principals via email. The online survey used a Likert-type scale that consisted of 40 items focused on teachers’ perceptions of student motivation and student autonomy with the blended learning environment. The analysis of the data was based on the responses of 75 teachers from the 2 participating school districts. Statistical analyses of the data revealed that the amount of teacher technology use, student technology use, learning management system use, and type of professional development did not have a significant relationship with participants’ perspective of student motivation or student autonomy. The research also did not reveal a significant relationship between participants’ age and perception of student motivation. However, this research revealed a significant relationship between participant age and participants’ perception of student autonomy. The study revealed that, as participant age increased, participants’ mean student autonomy scores decreased