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Discovering Devonian Microfossils

ABLE 2005. Discovering Devonian Microfossils. Charlie Drewes Ecology, Evolution & Organismal Biology Iowa State University, Ames IA. What are microfossils?.  fossilized remains (plant, animal, protozoan)  derive from hard parts (exoskeleton, endoskeleton, covering, shell, teeth)

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Discovering Devonian Microfossils

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  1. ABLE 2005 Discovering Devonian Microfossils Charlie Drewes Ecology, Evolution & Organismal BiologyIowa State University, Ames IA

  2. What are microfossils?  fossilized remains(plant, animal, protozoan) derive from hard parts(exoskeleton, endoskeleton, covering, shell, teeth) less than 1-2 mm in size(> 0.001 mm) imbedded in rock or loose particles research utility(paleoenvironmental reconstruction, biostratigraphy, paleooceanography)  educational use(hands-on, inquiry, discovery)

  3. Focal Points: Evolution Biodiversity Paleontology

  4.  440-350 MYA 290-200 MYA  140-65 MYA 1.8-0 MYA

  5. DEVONIAN “the age of the fishes”

  6. DEVONIAN “the age of the fishes”

  7. Rockford  DEVONIANFossil Deposits in Iowa www.paleoportal.org/

  8. x I save

  9. ▼ ▼ small-sized granules andmicrofossils ▼▼ ▼▼

  10. p. 6 Microfossils & Accessories washed, sievings dispensing spoon C rubber-tippedwidgets

  11. microfossil sorting dish p. 4

  12. pp. 4 & 6 Retrieval & transfer of microfossils

  13. p. 7 Microfossil Category Checklist █Foraminifera(multi-chambered shell) █Charophyte algae(oogonia) █Sponge(spicules) █Bryozoa(branching or fenestrated tubes) █Snail(coiled shell) █Tentaculite(long, conical shell) █Polychaete(jaws) █Ostracod(bivalve carapace) █Brachiopod(articulating shells) █Crinoid(articulating, internal ossicles) █Conodont animal(jaw apparatus) █miscellaneous spines from unknown origin

  14. Microfossil Data Sheet p. 9 Name __________________ Date_____Microfossil Category____________________SketchesQuestions

  15. FORAMINIFERANS

  16. CHAROPHYTES - oogonia stoneworts

  17. SPONGE SPICULES

  18. BRYOZOANS

  19. GASTROPODS - snails

  20. TENTACULITES

  21. SCOLECODONTS annelids

  22. OSTRACODS seed shrimpcrustacean

  23. BRACHIOPODSlamp shells

  24. CRINOIDSsea liliesechinoderms

  25. CONODONTS hypothetical conodont animal

  26. unidentified spines, etc

  27. p. 7 & 8 Analysis and Questions  Comparative abundance of specimens from various microfossil categories? Comparison of students’ specimens to web images of microfossils? Other marine invertebrates and vertebrates represented as Devonian macrofossils? North America position during Devonian? Brief essay about Devonian environment?

  28. TAKE-HOME 1)CD:Image Gallery:Devonian Microfossils & MacrofossilPowerPt slides:Discovering Devonian MicrofossilsWriteup:Discovering Devonian Microfossils 2) Tube of washed sievings with microfossils 3) Microfossil tools (spoon, widget sticks, widget rubberlegs, microrulers) 4) Microfossil sample slide & slide-box

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