Geobulletin alpha

Petalodis Shark Tooth Fossil 

    The pictures shown in this post are of a freshly found shark tooth fossil from the Glen Dean Formation of Grayson County, Kentucky, USA. It appears to be a Petalodis (Owen, 1840) and dates to the Mississippian Period. This genus was named by the English paleontologist Richard Owen (1804-1892). Thanks to Kenny for the pictures.

Geotripper on How to Plan a Perfect Volcanic Eruption, Hawai'i Style! 

So you want to demonstrate a volcanic eruption for your field geology course, and are unsure how to proceed? Let the crew (of one) here at Geotripper help you to plan out the very best eruption experience for your students! There are several important steps and considerations:1) Pick a volcanoThis is a pretty important first step. Some volcanoes can be very dangerous, and we at Geotripper