All major life forms of the Cambrian Period were aquatic. True or False? Hint
Did transgression or regression of the seas characterize most of Cambrian time? Hint
Around the Middle Cambrian, where were most continents located? Hint
What effect did this paleogeography have on climate and life? Hint
Were landmasses drifting apart or closer together during the Ordovician Period? Hint
What factors are believed to have caused the mass extinctions at the end of the Ordovician? Hint
The Paleozoic Era is bracketed by two of the most momentous events in EarthÕs history. What were they? Hint
The epochs and series of the Ordovician each have a type location in what country? Hint
The boundary between the Cambrian and Ordovician periods is marked by fossils of what animal? Hint
In what national park is the Burgess Shale located? Hint
At the time the Burgess Shale was deposited, where was it located? Hint
When did the archaeocyaths appear in the fossil record? When did they disappear? Hint
How many families of archaeocyaths appeared during the Lower Cambrian? Hint
What landmasses were involved in the Taconic orogeny? Hint
During the Cambrian Period, a new ocean widened between the ancient continents of Laurentia, Baltica, and Siberia. What was the name of this ocean? Hint
What modern continents were part of Gondwanaland by the Late Cambrian? Hint
