Answers to Lab 1 Questions

	Station 1 The specimen is from the Alger Fm. of Ohio, Ordovician in age. It is a fossil blastoid, a relative of the crinoid. The calyx and arms are preserved in this specimen, which is pictured upside down. [Find out more about blastoids]. Answers: Fossil, Invertebrate, 440-495 MY (half point for saying it is a plant)
	Station 2 The specimen is a sandstone showing ripple structures on the surface. [Find out more about sandstone ]. Answers: Rock, Sedimentary, 292-320 MY
	Station 3 The specimen is a piece of granite, Devonian in age, showing characteristic mineral crystals on its surface. [Find out more about granite]. Answers: Rock, Igneous, 354-417 MY
	Station 4 The specimen is a mold of an ammonite, which is an extinct group of sea animals that are related to the living Chambered nautilus (and distantly related to octopus and squid). Ammonites were common animals in Mesozoic seas, including the Cretaceous when this animal lived. They became extinct at the end of the Mesozoic [Find out more about ammonites ]. Answers: Fossil, Invertebrate, 65-142 MY
	Station 5 The specimen is the molar tooth of a Woolly mammoth, similar to the one you saw in the first lecture. [Find out more about mammoths ]. Answers: Fossil, Vertebrate, less than 1.8 MY
	Station 6 The specimen is a chunk of fossilized tree trunk from the Late Triassic Petrified Forest, Arizona. You can still see some indication of the texture of the bark on the outside and a hint of the concentric circles of the growth rings on the surface. The wook has been replaced by minerals, however, giving the specimens a beautiful variety of color. [Find out more about Petrified Forest ]. Answers: Fossil, Plant, 206-227 MY (half a point for the ages of the entire Triassic, not just the Late: 202-251 MY)