tens {divDyn} | R Documentation

## The 10 million year resolution timescale of the Paleobiology Database

### Description

Roughly 10 million year timescale used in some analyses.

### Usage

    tens

### Format

A `data.frame` with 49 observations and 9 variables:

X10

  The name of the bin: Period and number.

ocean

  The primary state of the oceans from the point of carbonate precipitation. `ar` indicates aragonitic, `cc` indicates calcitic conditions. Based on §

ocean2

  §

climate

  Primary climatic characteristic: `w` denotes warm, `c` denotes cold.

`bottom`

  Numeric ages of the bottom boundaries (earliest ages) of the bins.

`mid`

  Numeric ages midpoints of the bins, the averages of `bottom` and `top`.

`top`

  Numeric ages of the tops (latest ages) of the bins.

`dur`

  Numeric ages of the durations of the bins.

`ten`

  Integer number identifiers of the bins. §correct to num!

### Details

This is an example time scale object that can be used in the Phanerozoic scale analyses. This time scale comprises 49 bins, roughly 10 million years of durations that result from the combination of certain standard stages.

### Source

Executive committee meeting (2015) of old Paleobiology Database. Additional variables were added by Wolfgang Kiessling.

[Package divDyn version 0.8.0 Index]