Ammonoid From Hartz Range - Australia

[Nandomas]

Hello everybody

I acquired (actually I traded for it) this ammonoid in Denver some years ago. The label says: Hartz Range, Australia

it measures 10 cm. in diameter

sobsob... those are the only words, non genus, no age :phew:

Someone can help me?

Edited February 6, 2011 by Nandomas

[Nandomas]

sometime the attachment doesn't work in the opening post

my guess is Lytoceras

Edited February 5, 2011 by Nandomas

[Ludwigia]

Ooooo that's a tough one Nando. I'd lean to Lytoceras as well, but the possibilities are manifold without at least the stage or series. Hopefully one of the Aussies takes a peek here.

Roger

Edited February 6, 2011 by Ludwigia

[Wrangellian]

There is a 'Hartz Mountains' in southern Tasmania, perhaps L-Mid Triassic.. that's all I can add for now.

[Nandomas]

Thanks guys. My wife thinks it is some kind of eteromorph, because she saw something very similar from Australia with the spires more open at Munich show

[Aramon]

I'm agree with your wife

I vote for Australiceras from Aptian, because of the tuberculated ribs in the inner whorls.

Edited February 7, 2011 by Aramon

[Nandomas]

I'm agree with your wife

I vote for Australiceras from Aptian, because of the tuberculated ribs in the inner whorls.

Thanks Aramon I really appreciate your help

[Mike from North Queensland]

Not being an expert on ammonites and not knowing that area I cant be sure from the photo.

Harts fange is in central Australia about 100 miles east of alice springs in the northern territory and is known for gemstones.

but would have been part of the early cretacious sea so the ammonite may match some of the ammonites I have picked up in central Queensland.

The prepped fossil is labeceras and the one in the moonstone is a Tropeum or at least that how the uni proffeser labeled them.

Both these specimens have little bumps on the outter edge as the fossil curves. Do not know how helpful of confusing this will make the identification.

[Wrangellian]

That's a different spelling - Harts vs. Hartz -?- I can't tell for sure by the pic but it looks like Hartz on the fossil..

[Aramon]

Not being an expert on ammonites and not knowing that area I cant be sure from the photo.

Harts fange is in central Australia about 100 miles east of alice springs in the northern territory and is known for gemstones.

but would have been part of the early cretacious sea so the ammonite may match some of the ammonites I have picked up in central Queensland.

The prepped fossil is labeceras and the one in the moonstone is a Tropeum or at least that how the uni proffeser labeled them.

Both these specimens have little bumps on the outter edge as the fossil curves. Do not know how helpful of confusing this will make the identification.

Hello !

Your ammonites are really interesting!

What do you mean by "bumps" ? I can see some tubercles on your ammonites, so they are both Autraliceras.

The genus Labeceras is restricted to micromorph tripartite ammonites.

Your ammonites are close to Tropeum (the external whorls are identical), but Tropeum had NEVER tubercles.

In my opinion all these genera of the Lower Aptian need for a strong palaeontological revision... But the material is rather rare (as specialists are!!!).