L2-1: Gunflint Chert, Kakabeka Falls Ontario. Precambrian, 1.9 billion years old

L2-2: Gunflint Chert, Kakabeka Falls Ontario. Precambrian, 1.9billion years old.

L2-3: Eosphaera in Gun Flint Chert. SL4754 
Kakabeka Falls Ontario.
Precambian

L2-4: Algae and fungi in Gunflint Chert. SL4755

L2-5: Miscellaneous organism in Gunflint Chert.

L2-5: Miscellaneous organisms in Gunflint Chert

L2-7: Chert from Alice Springs, Australia. Bitter Spring Fm. Precambrian 900 million years old.

Chert from Alice Springs, Australia. Bitter Spring Fm. Precambrian 900 million years old.

L2-6: Chert from Bitter Spring Fm.

L2-8: Thin section of Glenobotrydion. SL4765

L2-9: Chert filaments

L2-10: Kewatin Graphite, Early Precambrian (3.5 billion years). Pure form of carbon.

L1-79: Stromatolite, from Wyoming. Example of a chemical fossil

L1-78: Stromatolite from Tindle Limestone, Manitoba, Ordovician. Chemical fossil