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PART 1. Late Triassic (225-200 Ma [million years ago]) 1. Go to the website twdb.state.us/groundwater/aquifer/GAT/ for access to the Geologic Atlas...



PART 1. Late Triassic (225-200 Ma [million years ago])

1. Go to the website twdb.state.tx.us/groundwater/aquifer/GAT/ for access to the Geologic Atlas of Texas. Click on the “Dallas Sheet” & familiarize yourself with the zoom function and the color key on the right side of the map. Click on the “Big Spring Sheet” to locate the nearest exposure of Triassic age rocks. What town are these exposures near? What are they called (formation name)? Bookmark this website for future geology reference.

2. Go to the website www2.nau.edu/rcb7/nam.html for access to paleogeographic maps of North America. Click on “Late Triassic (210 Ma)”, then on the map itself, and locate the general region of Texas you zoomed to on the Geologic Atlas. Briefly describe the landscape. How far is it from a coastline? Bookmark this website for future paleogeography reference.

3. Go to the website scotese.com/climate.htm for access to paleoclimatic maps of North America. Click on the “Climate History” tab, then click on “Late Triassic Climate” to the left of the screen. Click on “Map Legend” to decipher the map symbols for lithologic (rock) indicators of climate. What was the Late Triassic climate of Texas and what is the rock evidence for this? Bookmark this website for future paleoclimate reference.

4. Review descriptions of the Late Triassic world in your textbook (151-4) & consult a website or two about Late Triassic life. List a few of the plants & animals you might encounter if you were a small theropod dinosaur roaming Late Triassic Texas. List the websites you consulted.



PART 2. Jurassic (200-145 Ma)

1. Return to your bookmarked “geology reference” website (see above). Click on the “Van Horn-El Paso Sheet” to find the only exposure of Jurassic age rocks in Texas. What town are these rocks near? What (formation name) are they called?

2. Return to your bookmarked “paleogeography reference” website. Click on “Late Jurassic (150 Ma)”. What has happened to the geography of Texas since the Late Triassic? Where was the nearest shoreline relative to your current home?

3. Return to your bookmarked “paleoclimate reference” website. Click on “Late Jurassic Climate”. What was the Late Jurassic climate of Texas & what is the rock evidence for this?

4. Review descriptions of the Jurassic world in your textbook (154-160) & consult a website or two about Jurassic life. List a few of the plants & animals you might encounter if you were a large sauropod dinosaur roaming Late Jurassic Texas. List the websites you consulted.


PART 3. Early Cretaceous (145-100 Ma)

1. Return to your bookmarked “geology reference” website & click on the “Dallas Sheet” to find the exposure of Early (“Lower”) Cretaceous age rocks that is nearest your home. How far away are these rocks? What are they called?

2. Return to your bookmarked “paleogeography reference” website. Click on “Early Cretaceous (115 Ma)”. What has happened to the geography of Texas since the Late Jurassic? Where was the nearest shoreline relative to your home?

3. Return to your bookmarked “paleoclimate reference” website. Click on “Early Cretaceous Climate”. What is “calcrete” and what does it indicate about the Early Cretaceous climate of Texas?

4. Review descriptions of the Early Cretaceous world in your textbook (160-162) & consult a website or two about Early Cretaceous life. List a few of the plants & animals you might encounter if you were a large ornithopod roaming Early Cretaceous coastal Texas. In particular, what plant group would have recently appeared on the landscape? List the websites you consulted.



PART 4. Late Cretaceous (100-65 Ma)

1. Return to your bookmarked “geology reference” website & click on the “Dallas Sheet” to find the exposure of Late (“Upper”) Cretaceous age rocks that is nearest to your home. How far away are these rocks? What are they called?

2. Return to your bookmarked “paleogeography reference” website. Click on “Late Cretaceous (75 Ma)”. What has happened to the geography of Texas since the Early Cretaceous? Where was the nearest shoreline relative to your home?

3. Return to your bookmarked “paleoclimate reference” website. Click on “Late Cretaceous Climate”. How has the climate of Texas changed since the Early Cretaceous? What is the rock evidence for this?

4. Review descriptions of the Late Cretaceous world in your textbook (162-4) & consult a website or two about Late Cretaceous life. List a few of the plants & animals you might encounter if you were a ceratopsian roaming Late Cretaceous coastal Texas. List the websites you consulted.









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