Abstract The Chicxulub impact (in the northern Yucatan Penninsula, Mexico) marks Cretaceous-Paleogene (K-Pg) boundary and is implicated in one of five major extinctions. Researchers have examined ejecta from impact, most recently a drill core crater itself, yet processes chemical reactions occurring vapor plume are poorly constrained. Rounded carbonate particles, identified as accretionary lapi...

Abstract We describe and interpret deposits associated with the final Ubehebe Crater-forming, phreatomagmatic explosive phase of multivent, monogenetic volcanic center. volcano is located in Death Valley, California, USA. Pyroclastic occur four main facies: (1) lapilli- blockdominated beds, (2) thinly bedded lapilli tuff, (3) laminated cross-laminated ash, (4) massive ash/tuff. Lapilli- block-d...

Undoubtedly one of the most popular pencil and paper games in the world is tic-tac-toe, also commonly known as noughts and crosses. The game has a longstanding history in many cultures across the globe. It has been posited that it may even have been played under the name of “terni lapilli” in Ancient Rome, where examples of the tic-tac-toe grid have been found etched in stone throughout the emp...

Impact ejecta from the Albion Formation are exposed in northern Belize. The ejecta come from the outer portion of the continuous ejecta blanket of the Chicxulub crater, which is located 360 km to the northwest. The basal unit of the Albion Formation is a 3⁄41-m-thick clay and dolomite spheroid bed composed of up to four discrete flows. The clay spheroids are altered impact glass, and the dolomi...

[1] Using a high-speed video camera, we studied oblique collisions of lapilli-size pumice cylinders (with no rotation before impact) on flat pumice targets. Our results show that the rebound angle, the ratios of the components of velocities and the energy loss vary with the impact angle. In particular, in collisions with an average yaw angle approximately equal to zero, we observed relatively l...

Otoliths are calcium carbonate structures located in the inner ear of fish; they are responsible for hearing and balance. The inner ear has three pairs of otoliths: the lapilli, the sagittae and the asterisci. The sagittae otoliths are the largest and their format is species-specific. Because of their composition, otoliths can resist to the digestive tract of ichthyophagous species, and they ca...