Search the Community
Showing results for tags 'Crinoid thin sections'.
Found 1 result
-
Photo1 The smaller piece was used to make the cross section and was approx 8.7mm in diameter. The larger piece was approx. 15mm long and 6mm in diameter. This piece was used to make the trans (along its length) section. This photo was taken using a Canon SX50 HS. The Canon SX50 can focus at ridiculously close distances. In this case 4.6mm Although I photographed using Crossed Polars, the Crinoid specimen in not birefringent. I tried using Darkfield illumination to see if more details could be brought out. Photo 2 (Top) shows the cross section using Crossed Polarized light at 4x magnification. Photo 2 ((Bottom) I switched microscopes and inserted a 9mm Darkfield stop. Photo 3 (Top) shows the trans section using Crosed Polarized light at 4x mag. Photo 3 (Bottom) was photographed with the 9mm Darkfield stop inserted. Photo 4 shows a small area of the trans section at 10x. The Crinoid Stems were purchased from the Rock Shed. Photo 5
