Faunal stage?

Did you mean | Travel | Economics | Finance | Marketing | Business | Culture | Geography | History | Life | Mathematics | Science | Society | Technology | New site added |

Add a link on the top of this Faunal stage page Express submission by secure payment ! <table><tr><td> <form name="APform" action="http://www.allopass.com/cb/check.php4" method="POST"> <input type="hidden" name="CDOC_ID" value="297865"> <input type="hidden" name="CSITE_ID" value="111941"> <input type="hidden" name="LG_SCRIPT" value="uk"> <table border="0" cellpadding="0" cellspacing="0" width="300"> <tr> <td colspan="3"> <img src="http://www.allopass.com/imgweb/script/uk/cb_os_top.gif" alt=""> </td> </tr> <tr> <td width="157" valign="middle" bgcolor="White"> <font face="Arial,Helvetica" color="Black" size="11" Style="font-size: 12px;"> <b>Enter your access ticket</b> </font> </td> <td width="80" bgcolor="White"> <input type="text" size="10" maxlength="10" value="Ticket" name="CODE" onFocus="if (this.form.CODE.value=='Ticket') this.form.CODE.value=''" style="BACKGROUND-COLOR: #E7E7E7; BORDER-BOTTOM: #000080 1px solid; BORDER-LEFT: #000080 1px solid; BORDER-RIGHT: #000080 1px solid; BORDER-TOP: #000080 1px solid; COLOR: #000080; CURSOR: text; FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT:bold; LETTER-SPACING: normal; WIDTH:85; TEXT-ALIGN=center;"> </td> <td width="58" align="center" bgcolor="White"> <input type="button" name="APsub" value="" onClick="this.form.submit(); this.form.APsub.disabled=true;" style="border:0px;margin:0px;padding:0px;width:48px; height:18px; background:url('http://www.allopass.com/img/bt_ok.png');"> </td> </tr> <tr><td colspan="3" width="300" height="13</font><br><img src="http://www.allopass.com/img/cb_bot.gif" alt=""></td></tr> </table> <input type="hidden" name="DATAS" value=""> </form> </td><td valign= op"><table border="0" cellpadding="0" cellspacing="0"> <tr> <td> <form name="cben" action="https://secure.allopass.com/cb/subscribe.php4" method="POST" target="DisplaySub"> <input type="hidden" name="START" value="1"> <input type="hidden" name="SDOC_ID" value="297865"> <input type="hidden" name="SSITE_ID" value="111941"> <input type="hidden" name="LANG" value="L_UK"> <input type="image" src="http://www.allopass.com/imgweb/script/uk/cb_subscribe_os.gif" alt="Ticket d'accès" onClick="window.open('','DisplaySub','toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=1,resizable=1,width=600,height=570');" border = 0> </form> </td> </tr> </table></td></tr></table>

---

---

Faunal stages are a subdivision of geologic time used primarily by paleontologists who study fossils rather than by geologists who study rock formations. Typically, a faunal stage will consist of a series of rocks that contain similar fossils. There will be one or more index fossils that are usually common, easily recognized, and limited to a single, or at most a few, stages. Thus, for example, a North American paleontologist finding fragments of the trilobite Olenellus would identify the beds as being from the Waucoban Stage whereas fragments of a later trilobite such as Elrathia would identify the stage as Albertan.

Faunal stages were very important in the 19th and early 20th Century as they were the major tool available for dating rock beds until the development of seismology and radioactive dating in the second half of the 20th Century.

Faunal stages are regional. They often include many formations of differing rock types that were being laid down in different environments at the same time. In recent years, regional and global correlations of rock sequences have become relatively certain and there is less need for faunal labels to refine the age of formations. There has been a tendency to use European and, to a lesser extent, Asian, stage names for the same time period world wide even though the faunas in other regions may have little in common with the stage as originally defined.

What does Faunal stage mean ? Search with Google !

Article on Faunal stage, category, different spelling or sense