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ECHINODERM: Recent sediment, Cary Cay, Belize. Cross section of an echinoid spine showing single-crystal optical behavior (unit extinction) and a very characteristic lacy or flower-like pattern produced by the regular, radial arrangement of large pores within the spine. Chapter 10: GRAINS: Skeletal Fragments Echinoderms; p. 183. Memoir 77: A Color Guide to the Petrography of Carbonate Rocks: Grains, textures, porosity, diagenesis by Peter A. Scholle and Dana S. Ulmer-Scholle
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ECHINODERM: Recent sediment, Cary Cay, Belize. Cross section of an echinoid spine showing single-crystal optical behavior (unit extinction) and a very characteristic lacy or flower-like pattern produced by the regular, radial arrangement of large pores within the spine. Chapter 10: GRAINS: Skeletal Fragments Echinoderms; p. 183. Memoir 77: A Color Guide to the Petrography of Carbonate Rocks: Grains, textures, porosity, diagenesis by Peter A. Scholle and Dana S. Ulmer-Scholle