Create a digital model of a football field. starting at the left and moving forward in time, label the
10-yard lines in years. using different colors, draw a horizontal line to mark the beginning and
end of each of the following periods and eras [note that the years have been rounded up for this activity]:

• cenozoic era (65 mya to present)
• triassic (245‒208 mya), jurassic (208‒146 mya), and cretaceous (146‒65 mya)
periods
• paleozoic era (570‒245 mya)
• proterozoic era (2,500‒570 mya)
• archean era (3,800‒2,500 mya)
• hadean era (4,600‒3,800 mya)