The Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago. As originally proposed in 1980 by a team of scientists led by Luis Alvarez, it is now generally thought that the K - Pg extinction was caused by a massive comet or asteroid impact, estimated to be 10 km wide, 66 million years ago and its catastrophic effects on the global environment, including a lingering impact winter that made it impossible for plants and plankton to carry out photosynthesis. Dinosaur. Their dominance continued through the Jurassic and Cretaceous periods and ended when the Cretaceous - Paleogene extinction event led to the extinction of most dinosaur groups 66 million years ago. The Paleogene ([pronˈpæliːədʒiːn] or [ˈpeɪliːədʒiːn] also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya.
The Cretaceous is a Paleogene extinction event in 2001.
Determine if the claim is supported, refuted, or if there is not enough information based on the evidence.

Claim: The Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago. As originally proposed in 1980 by a team of scientists led by Luis Alvarez, it is now generally thought that the K - Pg extinction was caused by a massive comet or asteroid impact, estimated to be 10 km wide, 66 million years ago and its catastrophic effects on the global environment, including a lingering impact winter that made it impossible for plants and plankton to carry out photosynthesis. Dinosaur. Their dominance continued through the Jurassic and Cretaceous periods and ended when the Cretaceous - Paleogene extinction event led to the extinction of most dinosaur groups 66 million years ago. The Paleogene ([pronˈpæliːədʒiːn] or [ˈpeɪliːədʒiːn] also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya.

Evidence: The Cretaceous is a Paleogene extinction event in 2001.

Options: 

 - supported

 - refuted

 - not enough information
refuted
Determine if the claim is supported, refuted, or if there is not enough information based on the evidence.

Claim: The Cretaceous - Paleogene (K - Pg) extinction event, also known as the Cretaceous - Tertiary (K - T) extinction, was a mass extinction of some three-quarters of the plant and animal species on Earth that occurred over a geologically short period of time approximately 65 million years ago. As originally proposed in 1980 by a team of scientists led by Luis Alvarez, it is now generally thought that the K - Pg extinction was caused by a massive comet or asteroid impact, estimated to be 10 km wide, 66 million years ago and its catastrophic effects on the global environment, including a lingering impact winter that made it impossible for plants and plankton to carry out photosynthesis. Dinosaur. Their dominance continued through the Jurassic and Cretaceous periods and ended when the Cretaceous - Paleogene extinction event led to the extinction of most dinosaur groups 66 million years ago. The Paleogene ([pronˈpæliːədʒiːn] or [ˈpeɪliːədʒiːn] also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago (Mya) to the beginning of the Neogene Period Mya.

Evidence: The Cretaceous is a Paleogene extinction event in 2001.

Options: 

 - supported

 - refuted

 - not enough information
user
refuted
assistant