Fossilized Shark T eeth 41 SECOND FLOOR EXHIBITS SandSelenit e Bladed Crystals These crystals from Naica Chihuahua Mexico formed in an arid evaporitic en vironment in sandric h layer s not far below Ear th s surface Their bladed shape is a typical crystal form of selenite the colorless gypsum that cements the sand grains together Purchased b y the Society By exiting the Council Room from the single southeast door you will come upon an atrium with a rock garden that features a serpentine boulder as described below Ser pentine Boulder This boulder is made up of metamorphic serpentine minerals that contain high concentrations of magnesium and iron This boulder and another large one in the fower g arden near the front of the building are from the Mother L ode area on the western slope of the Sier ra Nevada California Collected b y Christoph W H Hulbe and students from Sacramento City College Ecologic concept from Helen L Cannon US Geological Surv e y Denv er Colorado Gifts from John A Huberty through Bennie W T ro x el for mer science editor of the Society As you make your way back down the hall on the right you will see fve framed drawings J J Y oung Dr a wings These are from the R epor t of Exploring Expedition from S anta F e New Mexi co to the J unction of the Grand and Green Ri ver s in 1 859 by Captain J N Ma comb whic h w as published in 1 87 6 by the U S Depar tment of Engineering The drawings by J J Y oung are adapted from sk etc hes by J S Newber ry Gift from Edwin B Eck el US Geological Surv e y Denv er Colorado and for mer e x ecutiv e secretary of the Society