Here are photos from my most recent work on calcareous crusts from Turtle Creek, Beloit, WI.

Cobble from Turtle Creek that is coated with a several-mm-thick carbonate crust. Golden-brown to blue-green colors probably are due to diatom and cyanobacteria epiflora.	Cyanobacteria (filaments; 5 µm thick) and diatom frustules (upper left) are preserved within the crusts as seen in these scanning electron microscope photographs.

Publications on algae:

Mankiewicz, C., 1988, Occurrence and paleoecologic significance of Halimeda in late Miocene reefs, southeastern Spain: Coral Reefs, v. 6, p. 271-279.

Horodyski, R.J., and Mankiewicz, C., 1990, Possible late Proterozoic calcareous algae from the Pahrump Group, Kingston Range, southeastern California: American Journal of Science, v. 290-A, p. 149-169.

Mankiewicz, C., 1992, Calcareous algae, in Schopf, J.W., and Klein, C., eds., The Proterozoic biosphere: a multidisciplinary study: Cambridge , Cambridge University Press, p. 359-367.

Mankiewicz, C., 1992, Described taxa of Proterozoic and selected earliest Cambrian carbonaceous remains, trace and body fossils: Proterozoic and Early Cambrian calcareous algae, in Schopf, J.W., and Klein, C., eds., The Proterozoic biosphere: a multidisciplinary study: Cambridge , Cambridge University Press, p. 981-998.

Mankiewicz, C., 1992, Obruchevella in the Middle Cambrian Burgess Shale: preservation and taxonomic affinity: Journal of Paleontology, v. 66, p. 717 729.

Mankiewicz, C., 1986, The role of calcareous algae in a late Miocene (Messinian) reef, southeastern Spain: Society of Economic Paleontologists and Mineralogists Midyear Meeting (Raleigh, 1986), Abstracts with Program, p. 71.

Mankiewicz, C, 1986, Coralgal associations in a late Miocene (Tortonian) reef, southeastern Spain: Geological Society of America Abstracts with Programs, v. 18, p. 680.

Mankiewicz, C., 1988, The record of early metaphytes: Vendian and Early Cambrian calcareous algae [Abstract]: The Proterozoic biosphere: a multidisciplinary study, Symposium of the Precambrian Paleobiology Research Group Proterozoic, August 1988, University of California, Los Angeles, p. 43-44.

Mankiewicz, C, 1988, Obruchevella in the Middle Cambrian Burgess Shale: preservation and taxonomic affinity: Geological Society of America Abstracts with Programs, v. 20, p. A226.

Mankiewicz, C., 1994, Preliminary study of microbial calcareous nodules from a freshwater stream, Beloit, Wisconsin: Death Valley International Stromatolite Symposium, October 1994, Laughlin, Nevada, p. 46.

Mankiewicz, C., Martin, J., Crockett, J., Bula, S., Kroese, J., Cox, J., and Mendelson, C., 1997, Microbial crusts from Turtle Creek, Beloit, Wisconsin: Geological Society of America Abstracts with Programs, v. 29, no. 4, p. 57.    

Ballou, Stephen M., 1999, Skeletal stromatolitic nodules in Turtle Creek, southeastern Wisconsin: factors affecting their formation and distribution: Geological Society of America North-Central Section Abstracts with Programs, v. 31, No. 5, p. A-3..
[Steve Ballou, Beloit College geology major]

Beck, Eric, 1991, The response of coralline algae to herbivory and energy of the environment: Fourth Keck Research Symposium in Geology (Franklin & Marshall College), p. 42-46.
[Eric Beck, Beloit College biology and geology major]

Berger, Amy C., 1991, A comparative study of modern and Pleistocene environments of coralline algae on San Salvador Island, Bahamas: Fourth Keck Research Symposium in Geology (Franklin & Marshall College), p. 52-54.
[Amy Berger, Pomona College geology major]

Desmarais, Kathryn, 1993, Morphology and taphonomy of Neogoniolithon on San Salvador Island, Bahamas: Sixth Keck Research Symposium in Geology (Whitman College), p. 224-227.
[Kathryn Desmarais, Beloit College geology major]

Desmarais, Kathryn, 1993, Taphonomy and morphology of Neogoniolithon strictum, San Salvador Island, Bahamas: Geological Society of America Abstracts with Programs, v. 25, no. 6, p. A-161.
[Kathryn Desmarais, Beloit College geology major]

Mankiewicz, C., Martin, J., Crockett, J., Bula, S., Kroese, J., Cox, J., and Mendelson, C., 1997, Microbial crusts from Turtle Creek, Beloit, Wisconsin: Geological Society of America Abstracts with Programs, v. 29, no. 4, p. 57.
[Jennifer Martin, geology; Jonathan Crockett, geology; Staci Bula, biology; Jesse Kroese, biology; Jason Cox, sociology. All students attended Beloit College when work was done]

Martin, Jennifer P., 1996, Skeletal stromatolitic crusts in Turtle Creek, Rock County, south-central Wisconsin: their composition and distribution: Geological Society of America Abstracts with Programs, v. 28, no. 6, p. 55.
[Jennifer Martin, Beloit College geology mjaor]

Parsons, Shannon M., 1989, Halimeda species distribution and sediment contribution in shallow water marine environments of San Salvador Island, Bahamas: Second Keck Research Symposium in Geology (Colorado College), p. 44-47.
[Shannon Parsons, Beloit College geology major]