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I purchased some Ptychodus teeth and I can not determine the exact ID on my own. They are smaller than P. whippeli or P. mortoni teeth I have and bigger than the single P. anonymous tooth I have though that is the species I originally though, and still think these are. They are from the Kamp Ranch section of Eagle Ford in Texas. I consulted a very well put together ID guide here but am still just not sure what I have, other than nice Ptychodus teeth lol Any help would be appreciated.
I thought this might be something that would be interesting enough for someone to take a stop a Penn Farm one of these days. Penn Farm in Cedar Hill State Park is a very historic and tranquil place in the rolling hills along the Eagle Ford/Austin Chalk contact that is a much loved attraction in the DFW area. I have been going to Penn Farm since I was a very young child, but in April of 2017 I went there with fossils on my mind. In Febuary I had found an ammonite on a rock used to support the door to a cellar (FIG. 37) but had not looked closely at any of the nearby rocks used as stepping stones. As I was going through Penn Farm enjoying the scenery and sights I also scrutinized any rocks that I saw. When I came upon the New Penn Farm House (see map in FIG. 1) I studied the rocks used as stepping stones and started finding both the gracile and robust forms of Collignoniceras woollgari scattered all over many of the rocks with two rocks in particular having the most specimens. It seems that all of the C. woollgari specimens are just impressions. Not sure why. I have since gone back and studied the rocks closer and have identified them as being from the local Kamp Ranch subunit based on the fauna and matrix type. On the rocks, I have found C. woollgari plates, oyster hash, and on the rock first shown in FIG. 25 I found what appears to be some type of shark tooth. I have also looked more closely at the specimen on one of the rocks used to support the door to a cellar that is right next to the stepping stones and I am pretty sure that it is a very large robust C. woollgari. HGMS’ book Texas Cretaceous Ammonites and Nautiloids does say that C. woollgari can have diameters of 200 mm which would place this specimen well within that range, but it is still the largest specimen of this species that I have seen in person if it is indeed C. woollgari. In July, I talked to a couple park rangers about the rocks and they told me that they were aware of them and that when the Penn family originally build the house in 1876 they specifically chose the rocks with fossils on them. It shows the hardiness of the matrix that these rocks have been trampled upon for 142 years and the fossils are still in decent shape. I know I wouldn’t be able to say the same for the Austin Chalk. Here are the pictures. They were taken on Wednesday, April 18, 2018. A ruler is included in many of the photos for scale. FIG 1: Map of Penn Farm.
I was cleaning some matrix I got from the Kamp Ranch formation in Dallas last weekend and found this tiny thing in the matrix. I’m wondering if anyone can tell me what it may be without it being fully exposed. The picture quality is not that great. I sure tried to get better pics, but wasn’t able to. It is 5 mm wide at most. So it is difficult to get a good close up pic of it. It’s 4 sided pyramid shape with a peak in the middle that almost looks like it has a groove down the middle of the peak. It was in a loose fragment of matrix I pried off a slab. Some of the surface of the item remained in the negative half of this. That is where you see the lighter color on the top and sides. This is a pic of it when wet. Top looking down view. Top down view again while dry. Side view from one end. Side view from the other end. Maybe it’s a funky shaped pebble, but I don’t think so. All the other stuff in the matrix looks like shells or shell fragments along with shell and ammonite impressions and some fragments.