The Geological History of Connecticut Presentation
This presentation, given at Hillcrest Middle School for 7th grade students on January 15, 2013, explores the influence of geology on the Connecticut landscape. Ralph Lewis, a
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PowerPoint presentation about 'The Geological History of Connecticut Presentation'. This presentation describes the topic on This presentation, given at Hillcrest Middle School for 7th grade students on January 15, 2013, explores the influence of geology on the Connecticut landscape. Ralph Lewis, a. The key topics included in this slideshow are . Download this presentation absolutely free.
Slide1The Geological History ofConnecticut Presentation for Hillcrest Middle School Grade 7 January 15, 2013
Slide2from: the influence of geology on the connecticut LandscapePhoto Essay by Ralph Lewis, Retired Connecticut State Geologist http://www.wesleyan.edu/ctgeology/CtLandscapes/CTlandscapes.html The Tectonic Plates Today
Slide6from: the influence of geology on the connecticut LandscapePhoto Essay by Ralph Lewis, Retired Connecticut State Geologist http://www.wesleyan.edu/ctgeology/CtLandscapes/CTlandscapes.html
Slide7750 million years ago (precambrian time), the east coast ofNorth America was at westernmost Connecticut. Everything to the east was added later on, piece by piece, as continents collided, and closed up the Iapetos Ocean . The continent of Pangea was created.
Slide8About 200 million years ago,Pangea began to break apart and the Atlantic Ocean was born.
Slide10As the Atlantic Ocean grew, other large cracks orrifts formed in the Hartford Basin. Lava flooded into these basins.
Slide11These ridges in New Haven are the remnants of magma that flowed through the rifts and flooded the area. This is East Rock.
Slide12Rifting occurred throughout Jurassic time (213-144 Ma), alternating with quiet times where hardened lava and other rocks were eroded and deposited in many layers. Intersection of Rte. 9 & 72, Berlin
Slide13from: the influence of geology on the connecticut LandscapePhoto Essay by Ralph Lewis, Retired Connecticut State Geologist http://www.wesleyan.edu/ctgeology/CtLandscapes/CTlandscapes.html Different parts of Connecticut Came from Different Places Iapetos= Former Ocean Newark= Connecticut Valley Proto North America= Former Continent Avalonia= Former Continent
Slide14Weathering, Erosion andDeposition of rocks and sediments in Connecticut Some geologists believe that up to 30 km (18.63 miles) of the bedrock cover has been removed from Connecticut during this period!
Slide15Rocks that were more resistant to erosion (harder) became the ridges and high points of land we see today. Old Mine Park, Trumbull Indian Well Falls, Shelton
Slide16Areas with many faults and fractures, or lessresistant (softer) bedrock became the south-draining valleys and lowlands. Connecticut River, East Hampton Stream deposition at Savin Rock, West Haven
Slide17While the forces that created thebedrock of Connecticut were occurring over hundreds of millions of years, smaller cycles of glacial warming and cooling were occurring every 200,000 years or so.
Slide18the northern half of most of north america has beencovered by a continental ice sheet up to 2 miles thick! This happened 4 times over the last 2 million years! 26,000 years ago (Pleistocene times), the ice sheet was thick enough to completely cover Mt. Washington in New Hampshire.
Slide20Greenland TodayIce Sheet
Slide21Glaciers move over the land, scraping away rocks and transporting sediment
Slide2215,500 years ago, the ice sheet had nearlymelted out of Connecticut. Evidence of glaciation can be found throughout the state. End Moraine at Silver Sands State Park in Milford Striations or scratches on West Rock Ridge in New Haven Glacial erratic boulders in Ledyard