This link will take you to the latest

Geologic Time Scale (http://norges.uio.no/timescale.html)

from the International Union of Geologic Sciences (on NORGES site).

Devonian thru Cretaceous detailed charts (PDF files) show ammonoid zonation and correlation worldwide. You should be able to date all your fossil cephs to within a few million years :grin:

Thanks very much for this useful chart, Kevin. I've made it 'sticky' so it will remain at the top of the threads for reference along with some of the other resource-orientated threads.

Interesting that it now denotes 'Ediacaran' as a period in its own right in the Lower Cambrian as was determined last year.

This is fabulous, Kevin; I don't have anything close to this good in any of my books or bookmakred websites.

:notworth:

Here are a few more. If, like me, you are used to seeing colors according to the USGS. :wink: Not as detailed as the first link.

Stratigraphy.org (http://www.stratigraphy.org/)

select Time Scale Charts.

The time scale comparison charts are very interesting. Amazing to see how the geologic time scale has changed over the last century.

The Geowhen database is also very useful as not all papers conform to the new 2004 timescale, it helps correlate worldwide stages and some NW europe faunal stages.

SPECTACULAR !

wtg big Kevin, all my others are now rendered obsolete & duff !

Keef

Check out the new Time Scale Generator at Stratigraphy.org (http://www.stratigraphy.org/)
(blinking in the lower right corner)
It saves the image as an .svg file and you will need the latest Java

SPECTACULAR !

wtg big Kevin, all my others are now rendered obsolete & duff !

Keef


As in: see attached?

hey guys
here is a good geological timeline i made that took me ages :) enjoy

I can't see anything attached to your message, Fossilkid.

If you have found any ammonites you are most welcome to post images and details in the fossil forum.

Welcome too!:welcome:

hey phil
sorry here is the link as i tried to send a hyperlink but i will try my link here you go : http://www.fossilsgalore.com/geological_time_line.htm

Excellent work there Fossilkid. I think I might save a copy and use it as reference myself!

hey phil
thanks. plus just to let you know im only 16 years of age but i have soo much kowledge about fossils and geology u would be shocked by how much i know but thats what i have been told by paleontologists :) but i wont be big headed :)

Yes, :welcome: Fossil Kid! Nice Chart.

hey kevin
thanks :)

hey guys
i cant use a camera at the moment as i just come out of hospital after having an emergency operation on my hand so i am 1 handed at the moment. but i need an id for an ammonite i found in a cretaceous sediment rock. i only have 1 picture on my forum. i know i need permission before i put a link of my forum on anouther forum. so can i have permission to send a link to a post on my forum with the ammonite picture on please ?

To me, that doesn't sound like a problem whatsoever, no copyright issues with hyperlinking, Fossil Kid, unless you're hyperlinking to beyond a paid subscription type firewall. If you need "official" permission, than good ole' webmeister Tony will have to step in :grin:

He should be up in roughly 3 hours, I'd say...

hey ob
thanks here is the link to the ammonite i need id for : http://www.worldfossilforum.com/index.php?topic=17.0

It's the fact you've established it's Cretaceous, otherwise my initial guess would've been Psiloceras psilonotum, which alas is from the Hettangien...

A further clue might be found in the systematic account of the Ammonoidea in the 1966 Geol. Soc. Memoire on the Geology of the country around Canterbury and Folkestone

"Except for the Desmoceratid Beudanticeras, which is common in the mammillatum Zone and occurs frequently in the early beds of the Upper Gault, the "Leiostraca", or smooth ammonites are known only by a few chance finds of Hypophylloceras, Tetragonites, Pictetia, Desmoceras, Puzosia and Uhligella. These ammonites are thought to have preferred open waters and to have had their European centre of dispersal in the Mediterranean region."

The problem obviously being, that your picture is of a much more slender shell than any of the quoted species above...

Is your fossil much eroded? The posted picture is somewhat vague, so I can't make out very specific markings...

hey ob
thanks i will add that info to my database.

Super quick question for you:

Ammonites became extinct in which stage of the upper/late Cretacious? Do we know, more or less?

Cenomanian | Turonian | Coniacian
Santonian | Campanian | Maastrichtian

Thanks!

Well Toren as far as I understand it, ammonoids survived right up to the end of the Maastrichtian; indeed a few ammonoids have been found in France that have been dated up to a few hundred years(!) before the K-T boundary. However, a paper that was published last year revealed that a few scaphitid ammonites may have soldiered on to the early Eocene by a couple of million years in European waters.

Links to both papers are available in the 'New Papers on Fossil Cephalopods' thread.

Thanks Phil, that's perfect!

Here (http://www.chronos.org/downloads/toweroftime.pdf) is a cool poster from the CHRONOS.org site. It shows a few nautiloids for the early paleozoic but only dinos for the mesozoic. 8-)


Quite frankly I think the colors on the time scale suck.:mad:

It's not so much the colours but that amazing LSD inspired OTT painting on the right that disturbs me.

Good chart, have bookmarked it.

Latest Zonation for part (most) of the Late Cretaceous of the Western Interior US. Contains a nice history of the zoning of late cretaceous rocks, fun to see how it has changed and been refined.

(about 3M pdf)

Cobban, W.A., Walaszczyk, Ireneusz, Obradovich, J.D., and McKinney, K.C., 2006 (http://pubs.usgs.gov/of/2006/1250/pdf/OF06-1250_508.pdf), A USGS zonal table for the Upper Cretaceous middle Cenomanian−Maastrichtian of the Western Interior of the United States based on ammonites, inoceramids, and radiometric ages: U.S. Geological Survey Open-File Report 2006-1250, 45 p.