1. Stephanie
Bontorin
Konstantinos
Papadimitrios
Pennsylvanian Period
It’s old. It’s gone. WHO CARES? (The Pennsylvanian Dutch do) It’s only half of the carboniferous.

2. Description of time period
Pennsylvanian time period
The Pennsylvanian is the youngest sub period of the Carboniferous period
It lasted from approximately million years ago
The Pennsylvanian period has been subdivided into four stages
The bashkirian (Oldest)
The Moskovian
The Kasimovian
The Gzhelian (Youngest)
During this time period equatorial swamps had large amounts of organic beds laid down
These eventually turned into the coal deposits which many countries now use for fuel.
The tem Pennsylvanian is of American origin while late Carboniferous Period or Silesian Period are preferred internationally.

3. System Subsystem/ Series Stage Age (Ma)
Permian
Cisuralian
Asselian
younger
Carboniferous
Pennsylvanian
Gzhelian
299.0–303.9
Kasimovian
303.9–306.5
Moscovian
306.5–311.7
Bashkirian
311.7–318.1
Mississippian
Serpukhovian
318.1–328.3
Viséan
328.3–345.3
Tournaisian
345.3–359.2
Devonian
Upper
Famennian
older
Subdivision of the Carboniferous system according to the ICS.[1]

4. Subdivisions The Bashkirin The Moscovian
Named after the Bashkirs, who lived in the Bashkortosan republic in the southern Ural Mountains
This Sub period was first introduced in 1934 by Sofia Semikhatova
The end of the Bashkirin marked the first emergence of the condont; eel like creatures.
During this time the first fusulinids began to appear, eventually they would form a vast limestone layers due to the composition of their shells.
The Moscovian stage was introduced by Sergei Nikitin in 1890
He defined this stage by the types of brachiopods found in the Moscow basin
The end of the Moscovian is marked by the appearance of the first ammonite genus (parashumardites)
The beginning of the Moscovian is difficult to pinpoint but as a generality the appearance of the condonts is considered the start.

5. Sub divisions cont. The Kasimovian The Gzhelian The Kasimovian
The name is taken from the russian city of Kasimov
Witch lies eastern of Moscow
The stage is defined by its deposits of limestone, dolomite mudstones, and some siltstones
The beginning of this stage is usually marked by the first apperance of advanced fusilinids
Gzhelian
Its named after the Russian city Of Gzhel the beginning of the Gzhelian is marked by the first apperance of the conodont (Streptognathodus zethus)
The beginning of the Permian or the end of the stage is marked by the first apperance of streptognathodus isolatus

6. Landforms and Continent Positions
During the Pennsylvanian period the continent of the world were split in to two large land masses called Pangaea and Gondwanaland.
At this time Pangea was in formation and did not look like the models which show all of the continents melded together as in latter stages.
Modern North America was located around the equator while South America, India, Africa, and Australia were at the south pole covered in ice
The Paleo-Tethys sea was nestled between bits of modern China, Russia, North America and the Indian sub-continent
Much of the world was dominated by a huge body of water known as the Panthalasic Ocean (Panthalasic translates roughly to covering everything ocean everywhere)

8. Climate
With Gondwanaland shifting around the south pole there were many period of freezing and thawing
Because of this the ocean was prone to recede and then again cover costal lowlands
Repeating layers of sedimentary layers are common in the Pennsylvanian period
sandstone, shale, coal, limestone, and sandstone again are the common cyclothems of rock formations
Formation
Ice in Gondwanaland melted causing sea levels to rise. Rivers and streams deposited sediemnts in lowland areas in order to return to equilibrium(sandstone + shale)
As the rising of the seas began to settle in specific locations rich costal swamps formed and took in organic matter rich in carbon (coal)
The sea completely moves in and forms a shallow marine enviroment. Shelled creatures begin to move in and form limestone layers.
Eventually ice would form again causing the process to start over

9. More Climate
As the Pennsylvanian period drew to a close the swamps that characterised its equatorial regions began to dry out
Gondwanaland remained relatively cold for the most part while the land situated around the equator continued to be warm and wet
At this time many of the giant plants so common to the Pennsylvanian began to die out
The Pennsylvanian atmosphere contained much more oxygen than today, about 35% rather than 21%, which lead to the growth or larger plants and animals.

11. Flora-It was big
Large trees and ferns grew in the warm moist equatorial regions during the Pennsylvanian
They produced so much oxygen that all life forms were able to grow to sizes never seen before or after the Pennsylvanian
Giant ferns, club mosses, tree ferns, and conifers dominated the landscape
When these enormous plants died they became the coal beds of the Pennsylvanian
The Pennsylvanian was also the time where seed bearing plants began to flourish after their fist appearance in the Devonian

13. Fauna Bryozoa Bryozoa are small (5mm) aquatic invertibrates
They feed using small retractable cillia by filtering water
Bryozoa date back to the ordovician period but were prominet sea creatures during the Pennsylvanian

14. Brachiopods Small bivalve animals
They have survived through millions of years
The most diverse current groups of brachiopods stemmd from those in the carboniferous
Their shells now compose many of the limestone deposits which are characteristic of the Pennsylvanian
A Carboniferous brachiopod Neospirifer condor, from Bolivia. The specimen is 7 cm across.

15. Amphibians
During the Pennsylvanian Amphibians were the dominant predators
They ate the huge insects of the land and also the fish of the sea
During this time period amphibians also began to move onto land and form early reptiles

16. Reptiles
Compared to their aquatic counterparts reptiles were fairly small and insignificant
The first reptiles were not much larger than cm
Hylonomus

17. Insects Meganeura- HUGE dragonfly. Largest hexapod ever.
Its wingspan could reach 75 cm
Arthropleura- was a big millipede, from one to two meters long and with up to 30 pairs of legs

18. Major Happenings
During the Pennsylvanian many mountains were formed as conbtinental plates came together at subduction boundries
The applalacian mountains whiuch still exist today were formed during this period
Huge limestone layers were formed when the crinoids and shelled creatures of the period died
Coal beds which are indicative of the period were laid down during the Mississippian and Pennsylvanian periods

20. BIBLIOGRAOPHY http://en.wikipedia.org/wiki/Pennsylvanian