Filenames: Do you want to display file names below images?

Sorting: Do you want to display in range entries at top of lists?

Time Control

The time period is currently set to: top=0Ma base=300Ma with sorting

Choose the time period you want to focus on

Or, select top and bottom chronostrat units

Top unit
Base unit
Or, enter a precise age range (in millions of years):

Top of age range:
Base of age range:

What does this do?

Our system contains taxa from a wide range of geological time, So, if you are specifically interested in one time period - e.g. the present day, or Paleocene, or Early Cretaceous - then it will be easier if it is clear which taxa are present in that time interval. To do this, you can set a time range of interest using the tools above. [NB We now finally have a nice graphical selector (background image from TimeScaleCreator), but I'll leave the other selectors on since they give more precise time selection.]

When a time range is set

A microfossil zonation chart

The chart below, from TimeScaleCreator, provides a compilation of planktonic foram and nannofossil zonations from throughout their geological range. All Ma ages on the mikrotax websites are currently based on this timescale (GTS2012).

Other charts - see Tools menu

nannofossil zonation chart