https://bereket-haileab.geology.sites.carleton.edu/files/original/30662e40af59e7c353178e81a775d7b6.jpg dad97add8bf9f1d8837c5a5ae221f2e1 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 BH250-256 Subject The topic of the resource Spherulitic or accretionary-lapilli-bearing rhyolitic tuff Description An account of the resource BH250-256 is a reddish-purple, fine-grained rhyolitic volcanic rock from Missouri, tentatively identified as an ignimbrite or tuff. It contains abundant rounded, millimeter-scale structures concentrated in distinct bands. These features may be accretionary lapilli formed from fine ash within an eruption cloud, or spherulites produced by the crystallization of volcanic glass during cooling. Similar features occur in Mesoproterozoic volcanic rocks of the St. Francois Mountains, including the Johnson Shut-Ins Rhyolite. This identification is provisional and will be evaluated through thin-section examination Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Missouri Creator An entity primarily responsible for making the resource Bereket Haileab Relation A related resource <iframe width="100%" height="480" src="https://drive.google.com/file/d/1PRYTi9mPwTke7V_pw0zmqFpCVPvf4VLn/preview" allow="autoplay"></iframe> Accretionary lapilli ash-flow deposit devitrification Felsic Volcanic Rock ignimbrite Johnson Shut-Ins Rhyolite Missouri pyroclastic rock rhyolite rhyolitic tuff spherulites St. Francois Mountains Volcanic glass welded tuff