[DOC] [TLE] The Carboniferous Period [PAR] The Mississippian and Pennsylvanian, in turn, are subdivided into a number of ... 
In addition to having the ideal conditions for the formation of coal, several ... As a 
result, most Mississippian rocks are limestone, which are composed of the ... 
divided into two groups: (1) the marine reptiles, lizards, and snakes, and (2) the... [DOC] [TLE] Carboniferous Period | geochronology | Britannica.com [PAR] The rocks that were formed or deposited during the period constitute the 
Carboniferous ... refers to coal-bearing strata that characterize the upper portion 
of the series ... Period is formally divided into two major subdivisionsthe 
Mississippian ... By Late Carboniferous (Pennsylvanian) times, plate movements 
had brought... [DOC] [TLE] CHAPTER 13 (LATE PALEOZOIC HISTORY) [PAR] 2. The seaways returned again during the Late Carboniferous and deltas 
became sites of ... The late Paleozoic was a time when the continents assembled 
to form the ... In North America, the Mississippian Period was the last time that 
widespread .... Today, Pennsylvanian coal is commercially mined in the Illinois 
Basin,... [DOC] [TLE] Illinois State Geological Survey Pennsylvanian Rocks in Illinois | ISGS [PAR] At the close of the Mississippian Period, about 320 million years ago, the sea ... 
producing a variety of lithologies in the Pennsylvanian rocks (see figure 2, below)
. ... Limestone was formed from the accumulation of the limy parts of animals and 
... In general, the sandstone-underclay-coal-gray shale portion (the lower units) of
... [DOC] [TLE] The Carboniferous Period of the Paleozoic Era - Timism [PAR] The distinction between the Pennsylvanian and Mississippian subsystems may 
also be ... The layers consist of sandstone, shale, "freshwater" limestone, 
underclay, and a coal bed. ... Great coal-forming forests developed as a result of 
rare freezing ... (8 inches) long, with the largest growing to about 2 meters (6.5 
feet) long. [DOC] [TLE] Carboniferous - Wikipedia [PAR] The Carboniferous is a geologic period and system that spans 60 million years 
from the end of the Devonian Period 358.9 million years ago (Mya), to the 
beginning of the Permian Period, 298.9 Mya. The name Carboniferous means "
coal-bearing" and derives from the Latin ... The Mississippian is about twice as 
long as the Pennsylvanian, but due to... [DOC] [TLE] Bedrock Geology of Ohio - Ohio History Central [PAR] Precambrian rocks beneath Ohio consist of igneous, metamorphic and ... upward, 
forming the East Continent Rift Basin, a portion of which is present in western 
Ohio. .... Two salt mines, about 2,000 feet beneath Lake Erie, mine rock salt for 
snow ... Late in the Devonian Period and continuing into the Mississippian Period
,... [DOC] [TLE] Free Flashcards about NATURAL HISTORY - StudyStack [PAR] THIS COAL-FORMING PERIOD CONSISTED OF 2 PORTIONS: 
PENNSYLVANIAN AND MISSISSIPPIAN, CARBONIFEROUS. PREHISTORIC 
ALIEN... [DOC] [TLE] geological eras: introduction for the teacher - Montessori Research ... [PAR] 2. Fossil records show the first evidences of life were bacteria living in shal- low 
waters. ... Paleozoic Era - Carboniferous (Mississippian, Pennsylvanian), 
Permian ... The Pennsylvanian Period is famous for its formation of vast coal 
deposits. ... During the later portion of the Pennsylvanian Period, the climate 
became. [DOC] [TLE] Cyclical Sedimentation of the Pennsylvanian Period and Its ... - JStor [PAR] The Pennsylvanian strata of western Illinois exhibit a cyclical repetition of ... 2 W. 
Stout, "Coal Formation Clays of Ohio," Ohio Geol. ..... pair of these consisting of 
sandstone below and calcareous beds abov ... stone sedimentation of the earlier 
Paleozoic in the Mississippi and ..... bear conglomerates in the lower portions. [DOC] [TLE] The geological story of Pennsylvania - Pennsylvania Department of ... [PAR] The Mississippian and Pennsylvanian Periods: ... back country. Perhaps, too, 
thoughts of the coal mines and steel mills that helped ... The dictionary lists two 
definitions of geology. ... geologic forces existed in the area while the rock was 
forming and ..... found that during the Late Silurian, a year consisted of 
approximately. [DOC] [TLE] Coal in

Question: This coal-forming period consisted of 2 portions:  Pennsylvanian & Mississippian
Answer: Carboniferous