The fraction of all species wiped out by the asteroid which struck the earth at the end of the Cretaceous period.
What is 3/4?
100
Which chamber of their shell did ammonites inhabit?
What is the largest chamber?
100
The award Luis Alvarez won for his work.
What is the nobel prize?
200
The element, found in samples from Gubbio, Denmark, and New Zealand, that the key to the idea of the Meteorite causing a mass extinction at the end of the Cretaceous period?
What is Iridium?
200
The percentage of species disappeared after the Cretaceous.
What is 95%
200
The Alvarezes' hypothesis on the clay layer with no forams in it.
What is an astroid impact?
300
Prior to the Catastrophe theory, how was the break in the fossil record at the end of the Cretaceous Period explained by Lyell?
What is an unaccounted for gap in the fossil record?
300
The second most common body part found.
What is the jaw?
300
Tiny creatures found in clay layers of Gola del Bottaccione
What are Foraminifera (or forams)
400
“Extraterrestrial Cause for the Cretaceous-Tertiary Extinction,” published in June 1980, was written by what two scientists?
Who are Walter and Luis Alveraz?
400
What were Ammonites called in medieval England?
What were serpent stones?
400
What did John Phillips map out to show when extinctions occurred?