6. Molds & Casts

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6.Molds & Casts EQ: How do fossils provide a record of Earth’s geologic history? Learning Target: I can compare and contrast the methods of mold and cast fossil formation. Learning Task: I will use play-doh to create a mold and plaster of paris to create a cast fossil. I can compare and contrast these types of fossils. Warm Up: Types of Fossils Molds & Casts Lab; Fossils over Time Molds vs. Casts – compare/contrast – in pages on iPad

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6. Molds & Casts. EQ: How do fossils provide a record of Earth’s geologic history? Learning Target: I can compare and contrast the methods of mold and cast fossil formation. - PowerPoint PPT Presentation

Transcript of 6. Molds & Casts

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6.Molds & CastsEQ: How do fossils provide a record of Earths geologic history?Learning Target: I can compare and contrast the methods of mold and cast fossil formation.Learning Task: I will use play-doh to create a mold and plaster of paris to create a cast fossil. I can compare and contrast these types of fossils. Warm Up: Types of FossilsMolds & Casts Lab; Fossils over TimeMolds vs. Casts compare/contrast in pages on iPad Welcome! Warm Up Monday 4/7/14Record your response at www.goo.gl/vta7d1

What are the 6 different types of fossils?

AmberMold*Cast*Carbon FilmTracePetrified 4th Quarter Table of Contents 1

TitleAssignment #Ice Cores2Ice Core Webquest3Fossil Notes4Getting into Fossil Record Webquest 5Fossil Vocab6Fossils over Time (Molds vs Casts) 7

Molds & CastsToday we will use modeling clay and plaster of paris to create mold and cast fossilsMaterials (Groups of 3 students)Tray with 8 Plastic Fossils & Fossil Guide1 stick of modeling clay1 cup of 10ml of plaster of paris5 ml of water1 craft stick1 piece of wax paper with masking tape1 sharpie to label tape with your names

Molds vs. CastsDecide which fossil your group would like to use. Ones that are medium size and have texture work best.Break your modeling clay in Work the halves of clay into 2 smooth, flat, evenly thick disksPress your fossil into one disk and place the other on top to make a fossil sandwich.Carefully peel away the clay on one side, and then remove the fossil.You may have to do this several times to make sure you have not torn or created holes in the clay Google Drive: 6.Molds vs Casts Worksheet Take picture of your molds and insert into your document. Molds vs. CastsPlace the clay on your wax paperYour Science teacher will add approximately 5 ml of water to your plasterUse the craft stick to mix the plaster and water. It should be the consistency of pancake batterUsing the craft stick, pour of your liquid plaster into each mold until level with the clayWrite your groups names and fossil onto the wax paper and place on the back shelf to dry Complete Worksheet Day 1Fossils over time (Molds vs Casts) 7

Using the chart on page 336 of your book and your Fossil Guide, arrange the 8 fossils in your tray in order based on the Period of time when they lived.

Copy the first 3 columns of the Geologic Time Scale on page 336 into your notebook on page 7

Next to the respective Periods, draw the appropriate fossil and label its name as given on the Fossil Guide Example of what the chart you create in your notebook might look like:ERAPERIODMILLIONS of YEARS AGO Picture/Sketch of Organism Cenozoic Quaternary1.8Tertiary66.4Cretaceous104MesozoicJurassic 208Triassic 245Paleoziod

Example of what the chart you create in your notebook might look like:

Answer the Questions about the fossilsWhich fossil is the oldest?Which fossil is the youngest?Describe the different Ammonites How have the Ammonites evolved over time?Describe the different Brachiopod shellsHow have the Brachiopods shells evolved over time?Describe the different TrilobiteHow have the Trilobites evolved over time?Why might the Trilobites be curled up?Would these fossils be molds or casts?

http://goo.gl/Vt2UvN

Teacher Lab Set-up

* Fossils and Fossil Guide are in ziploc bagsSample of students mold and castUsed Walmart clay ($0.97) and the scoop is 5ml Teaching Aid brand

2 scoops of plaster per cup and About 1- 1 scoops of water