The Catalyst is the weekly student newspaper of Colorado College. This issue was published April 25, 2008. Pages 2 and 3 of issue incorrectly dated April 11. Page 4 of issue incorrectly dated September 14, 2007. Page 5 of issue incorrectly dated August 13, 2007.
Poster created for the Arthur G. Pettit Memorial Lecture entitled, "Black Rome and the Big Easy: Race and Cultural Politics in Salvador, Bahia and New Orleans," by Christopher Dunn, to be given on Monday, February 25, 2008 in Gates Common Room, Palmer Hall, Colorado College. Sponsored by the History Department, Colorado College.
Poster created for The Lopat Memorial Lecture entitled, "Challenges to Liberal Democracy," by Francis Fukuyama to be given on Thursday, January 31, 2008 in Gates Common Room, Colorado College. [Sponsored by the Marianne Lopat Memorial Lecture Fund and the Political Science Department.]
Poster created for "Constitution Day at Colorado College," Thursday, September 18, 2008 in Gates Common Room. Lectures include "Church, State, and the Constitution" by Bill Hochman, and "The Constitution and American Foreign Policy" by David Hendrickson.
This paper investigates whether the curricular structure of an Economics course (semester, trimester, or compressed block schedule) has an effect on an undergraduate's subsequent retention of course material. We test separately for theoretical/process comprehension and for graphical construction/interpretation, while separating micro from macro content as well. We use an instrument to address the no stakes testing problem, and our Heckman two-stage estimations present some interesting results for educators and institutional policymakers alike.
This allotriomorphic granite is dominated by feldspar phases which are altering to clays. The mica phases are anhedral, emabyed, and filled with unaligned opaque inclusions.
This thin section consists of two oriented calcite crystals, both good for obtaining interference figures.
This schorl crystal is oriented parallel to the c-axis to aid in finding interference figures
The flame lamellae that pervade this thin section are cut thicker than ususal and thus display first order yellows and oranges, though the tartan twinning of the microcline retains the ususal first order grey birefringence. Grain boundaries between feldspars are lined with smaller feldspar grains, which gives the larger grains a scalloped appearance. The hornblende grains are highly irregular in shape and contain many inclusions of feldspar, opaques, biotite, and other unidentifiable phases.
A seriate-interlobate texture defines this quartzite. Grain boundary migration is evident from thickened and lobate grain boudaries. Subgrain walls are prevalent, as is undulose extinction. Recrystallization textures are present in portions of the thin section. Useful for finding interference figures
This thin section consists of two quartz crystals, one of which is oriented perpendicular to the optic axis and provides a perfect crystal with which to obtain an interference figure.
This thin section consists of two oriented tourmaline crystals, both good for obtaining interference figures.
The foliation in this coarse-grained rock is the result of compositional layering; discontinuous hornblende-rich zones separate poikiloblastic plagioclase-rich regions. Albite and Carlsbad twins in the feldspars are almost entirely obscured by randomly-oriented inclusions of sericite.
This thin section contains two main zones. One half contains subhedral grains of k-feldspar, quartz, orthopyroxene, biotite and opaques. Kink bands, deformation twins, and core-mantle structures (fine-grained felspar rimming the older grain) in the the feldspars show evidence of strain accomodation. Aggregates of finer-grained serieate-lobate quartz grains with thickened grain boundaries and uniform extinction show evidence of grain boundary migration. Larger quartz grains with undulose extinction and deformation lamellae also indicate strain accomodation. The opaque mineral(s) have rounded, anhedral grain shapes and tend to cluster with biotite and orthopyroxene. Biotite is subhedral, with kink bands and undulose extinction; it is generally found in the intersticies between grains, most commonly adjacent to orthopyroxene grains. Orthopyroxene is subhedral and occasionally embayed. The other half of the thin section is dominated by two porphyroclasts of feldspar. This portion of the thin section abounds with symplectic intergrowths of quartz and feldspar as well as much subgrain development in both mineral. Growing normal to the rims of opaques and biotite grains is a poplulation of acicular aluminosilicate.
This well-sorted, subrounded, chert-cemented quartz sandstone contains alternating clay-rich and poor layers. Accessory minerals and microcrystalline calcite are concentrated along the clay or hematite-rich layers. Hematite concretions and veinlets are found in this sample.
This porous, fine-grained, well-sorted, well-rounded, clast-supported quartz sandstone is cemented together with hematite. Clasts of microcline, hornblende, calcite, and chert are dispersed in minor amounts throughout the sample. The layering which is visible to the naked eye is unnoticeable in thin section.
A moderately-sorted, subrounded quartz sandstone with a calcite cement. Microcline and albite are present in smaller amounts than the quartz clasts. A luster-mottling texture is present, in which the calcite cement forms crystals larger than the clasts it cements, as indicated by the optical continuity and parallel twins across large portions of the thin section's cement. Layering is observed in thin section by zones of abundant cement alternating with more clast-supported, calcite-poor zones. Most quartz clasts show undulatory extinction and subgrain development.
This strongly foliated amphibolite shows evidence of mimetic growth of k-feldspar into elongate crystals due to restriction of a preexisting fabric defined by amphibole and micas. The dominant mica phase, chlorite, has anhedral (almost skeletal) grain shapes. Hornblende is the same. Both phases are highly embayed. Several hornblende grains contain euhedral feldspar 'inclusions' and the classic amphibole grain shape is lost along its margins due to encroaching feldspar grains. Chlorite tends to be associated with elongate epidote crystals or granular aggregates. Dusty fracture zones trace across the fabric of this sample and are filled with cataclastic breccia and glass. Euhedral apatite and small, rounded to larger, anhedral titanite grains are dispersed throughout the thin section, typically oriented with the foliation.
The feldspar grains in this thin section span a broad range of sizes, with larger grains displaying strong lamellae of either the blebby or flame variety. The mafic phases are anhedral to skeletal in shape and are much less abundant than the more felsic phases. Small zircon crystals are clustered with a hornblende aggregate.
Phenocrysts of resorbed plagioclase and k-feldspar give this otherwise glassy rock its porphyritic texture. A couple of resorbed pyroxene phenocrysts are present. Aligned needles of an opaque phase give the glassy groundmass a trachytic texture.