Ammonite Id - Weno Formation, Ft Worth Tx

[Roger]

Could use some help ID'ing this ammonite. I am thinking it is Mortoniceras sp. I collected it on the top of the Weno limestone at the contact zone with the Paw Paw clay in North Fort Worth. While it is basically a steinkern, there was a small spot where the suture was preserved (see view 1). There seems to be a row of tubercules low on the ribs with a double row near the keel. The tubercules low can be seen on the side view (view 2) and the oblique view (view 3) shows the double row. Another problem is that I have a very similar ammonite (same size, tubercules and all) that I collected from a Grayson site just to the south and east (North Richland Hills) of this site. Did Mortoniceras span the Weno,PawPaw and Grayson as the one I found in NRH was near the contact zone with the Woodbine?

View one - Suture pattern at 10X mag

View two - side view you can see the suture on the far left spanning the 1st, 2nd and 3rd ribs from the left. Also the lower row of tubercules can be best seen in this view (rib 4 from left)

View three - oblique view showing the tubercules (double row near the keel)

Thanks for you help

Roger