. Bulletin. Natural history; Natural history. Sovember, 1961 Smith : Amphibians and Reptiles o? Illinois The present topography reflects the Pleis- ocene history of the area. Although four tages of glacial advance, separated by inter- ;lacial periods of milder climate, are known o have occurred, the Illinoian lobe (over 100,000 years ago) and the Wisconsin lobe (about 20,000 years ago) are largely re- sponsible for the physiography of Illinois. Much of the northern half of the state is covered with thick deposits of relatively re-. Freeport Mean Jan. temp. Mean July temp. Mean annual temp. Mea
. Bulletin. Natural history; Natural history. Sovember, 1961 Smith : Amphibians and Reptiles o? Illinois The present topography reflects the Pleis- ocene history of the area. Although four tages of glacial advance, separated by inter- ;lacial periods of milder climate, are known o have occurred, the Illinoian lobe (over 100,000 years ago) and the Wisconsin lobe (about 20,000 years ago) are largely re- sponsible for the physiography of Illinois. Much of the northern half of the state is covered with thick deposits of relatively re-. Freeport Mean Jan. temp. Mean July temp. Mean annual temp. Mean inches snowfall Frostfree days Annual precipitation -160 -34 nx Chicago Mean Jan. temp. Mean July temp. Mean annual temp. Mean inches snowfall Frostfree days 160-170 Annual precipitation -34. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
