https://bereket-haileab.geology.sites.carleton.edu/files/original/19a2bd644e2ab58dc321a88f063ac4ad.jpg ca04421a466305040a105cc17f1c3a55 Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Sedimentary Rocks Subject The topic of the resource This collection includes sandstones, limestones, breccias, conglomerates, dolostones, shales, oolites, and BIF. Creator An entity primarily responsible for making the resource Bereket Haileab Source A related resource from which the described resource is derived Housed in Anderson Hall, Carleton College. Format The file format, physical medium, or dimensions of the resource Thin sections, thin section scans, hand samples, hand sample images, photomicrographs. Thin section and hand sample Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource BH250-175e Subject The topic of the resource Bass Limestone Description An account of the resource Major Mineral: calcite Minor Mineral: chert In thin section, the Bass Limestone contains low-birefringence, low-relief minerals identified as chert (microcrystalline quartz), which formed through diagenetic recrystallization. As the oldest sedimentary unit in the Grand Canyon, the Bass Limestone has experienced low-grade metamorphism, leading to the recrystallization of both calcite and chert. The calcite grain size in the Bass Limestone is substantially larger than that of younger limestones in the region, such as the Muav Limestone, reflecting the prolonged effects of metamorphism and diagenesis. This contrasts with younger and less-altered limestones like samples BH250-122, 125, 128, 140, 175f, 122wc, and 128c, which retain finer-grained textures. You will find many calcite grains in Bass Limestone thin sections are cut perpendicular to sub-perpendicular to the c-axis, producing optic axis figures or off-centered uniaxial negative interference figures when viewed under crossed polars. Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Location: Mile 132 Stone Creek, Grand Canyon, Arizona, USA Nearby Geographic Feature: Grand Canyon Date A point or period of time associated with an event in the lifecycle of the resource August 2021 Source A related resource from which the described resource is derived From the rock collection of Bereket Haileab. Sample BH250-175e. Housed at Carleton College in Minnesota. Type The nature or genre of the resource Thin section and hand sample Relation A related resource <iframe width="100%" height="600" style="border: 0;" src="https://carleton.maps.arcgis.com/apps/instant/media/index.html?appid=8037adb4b94d486ba73f39239f96df08" frameborder="0" allowfullscreen="allowfullscreen">iFrames are not supported on this page.</iframe><br />View on ArcGIS Online <a href="https://carleton.maps.arcgis.com/home/item.html?id=8037adb4b94d486ba73f39239f96df08">here</a><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1gTCUwhv6yjJjZXJaPqT5vpls9UoR6n3H/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1Y4zVvdk6Re3auO8WKkE0RZbPhSeMwWQG/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1HjjsLU5E38aCm1SLQ0-duPBt5QmIXAzp/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1z2X-Ax5M-dADrXeol0MftqkY_ftNtdc0/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1LQekDEEnqGJYa2xjwKrIpP0WLkoI8pYL/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1CiMHss2hZfN1XPhnN1H0olDheYeNamkh/preview" allow="autoplay"></iframe>&nbsp;&nbsp;<br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1qB7P3Acyfm1heCLZpvzgJheMZGl2FBqw/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1yCEFPiaRGQKogdgcuRoylCTLgOA32IuJ/preview" allow="autoplay"></iframe><br /><br /><iframe width="100%" height="480" src="https://drive.google.com/file/d/1GtxhLZojNuUMDvBlTA7oA_exRrr2QyNX/preview" allow="autoplay"></iframe> Creator An entity primarily responsible for making the resource Bereket Haileab Contributor An entity responsible for making contributions to the resource Bereket Haileab Bass Limestone Chert diagenetic recystallization Grand Canyon Supergroup limestone microcrystalline quartz