User:Davidbyang/sandbox

References:

http://science.sciencemag.org/content/327/5965/571.full Abstract: There are few fossils of dinosaurs from the Jurassic period that are close relatives of birds. A newly discovered dinosaur from the Late Jurassic was found to be part of the clade of the closest relatives of birds.

This article also talks about the ghost lineages of Alvarezsauroidea, along with an image of a ghost lineage.

http://rsbl.royalsocietypublishing.org/content/10/1/20131003.short#ref-8 Abstract: This article questions the methodology of dating mammalian fossils and places ancestors of placentals after the Cretaceous-Paleogene boundary. Discusses how ghost lineages can underestimate the time period in which lineages diverge, as ghost lineage analysis can only give the smallest amount of time in which gaps in the fossil record occur.