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Found 2 results

  1. First post...here goes. For the past 15 years, I've worked for Smith Bits (oilfield drill bit manufacturer) and have drilled thousands of wells all around this planet. So in a sense, I destroy fossils for a living which is exactly the opposite purpose of The Fossil Forum. So, to add "yang" to my "yin," I started collecting fossils from all over the Texas Hill Country on or near my ranches. I take them home and clean them with my wife's dental hygiene tools while sitting in our pool on the weekends. It's a relaxing hobby with the only downside being that the calcium carbonate raises the pH in the pool. So, I'm constantly having to add muriatic acid to the pool chemistry. Plus, my two boys love digging in the dirt. That being said, I need a community opinion on the correct identification of several fossils that I've found. Group 1 Found in Lower Cretaceous (Trinity Age) Glen Rose Formation off Highway 55 in between Barksdale and Rocksprings Texas. Are they Loriolia texana? Group 2 Found in the Lower Cretaceous (Trinity Age) Glen Rose Formation off Highway 1050 in between Utopia and Leakey Texas. Notes: Although most are damaged, the largest one of the group has a depressed unpaired ambulacrum. The upper-most right specimen has a hole bored into the bottom side of it. Are they Heteraster obliquatus? Group 3 Found in the Lower Cretaceous (Trinity Age) Glen Rose Formation off Highway 1050 in between Utopia and Leakey Texas. Left: Phymosoma texanum? Middle: Club shaped spine? from Loriolia texana or what else? Right: Porocystis globularis? I know it's not an echinoid, but found in situ approximately 3 inches away. Thank you in advance for your help.
  2. Tracking The Glen Rose

    January 2, 2010 The Lower Cretaceous Glen Rose Formation (Kgr) of Central Texas is roughly 110 million years old. Its classic exposures look like man-made steps or solid blocks that are occasionally interrupted with softer rock or marl. The formation is typically divided into upper and lower units by a layer of Corbula fossil clams. Just below this layer was the destination I wanted to find for my first fossil hunt of the year. It takes its name from the isolated occurrence of an ornate fossil sea urchin - the Salenia texana zone! A bright dawn had not yet thawed the frost when I headed to meet my friend, Bob. He was excited to show me a new quarry where he had found echinoids the previous month. When we arrived at the site, he oriented me to the most productive layers in the formation, and we started hunting the youngest strata. I immediately began to find fossils. Erosion of the shelf, we were searching, left fragments of 'heart' urchins, gastropods, and bivalves everywhere. I was trying to be selective, looking for the better preserved specimens, but it was hard to pass up an unusual oyster or clam. Oyster (Ceratostreon weatherfordensis ?) with the partial mold of the shell where it was attached Juvenile Arctica sp. clam Soon, Bob was calling out, "Spiny urchin!" with periodic repetition. He wryly commented, "I just seem to be a magnet for those things." Meanwhile, I gouged my elbow on rock as I crawled along the ground. Glancing to check the damage, I spied one of the small, prickly echinoids. It was just one of those small moments...that capture your love of the outdoors. The late morning light was perfect, and when I reached for the camera, a little heart urchin caught my attention. Even better. So, I digitally captured the two 'echies' before putting them in my box. We finished the morning and the rest of the layer with several more echinoids and a partial crab claw. Loriolia texana echinoid with Orbitolina texana foram Heteraster obliquatus echinoid among Orbitolina texana forams Loriolia texana echinoid Some finds after a little cleaning From this area, we moved down into the "zone". A hard limestone bench capped a six foot thick layer of softer rock. It weathered into chunky clay before a transition back to solid stone. Even within this bracketed strata, I noted some subtle differences in the coloration and hardness. But meanwhile, Bob had started finding echinoids while I was "getting the lay of the land". The marble-sized Leptosalenia texana were eroding with regularity from the top half of the zone. A small, disk-like foram, known as Orbitolina texana, littered the ground. Scattered among them were a variety of different gastropods and a non-fossil caterpillar. Leptosalenia texana with forams and gastropods Caterpillar Leptosalenia texana echinoids Bob previously mentioned that he had found a couple of plates (a part of an urchin's shell) from a very uncommon echinoid on his last visit. So, as we leaned against the wall of the formation, I asked him what else he remembered. He described them as being more whitish in their preservation than some of the other finds we were making; and when he said it, I thought of the variation in the rock I had seen earlier. We had already found fragments of the spines which the 'Salenia' urchins used to protect their shells; but I was not tracking them - we were tracking a cidarid echinoid! In the Glen Rose Formation, two species have been described: Phyllacanthus texanus and P. tysoni. So, I grinned when I saw part of a larger, bumpy spine sticking out of the rock. About that time, Bob suggested that we move over a short distance to a fresh spot. Hunting anything, with success, requires identifying and following certain clues. In the new spot, I put my suspicions to the test. A few feet below the caprock, I found a lighter layer that was somewhat hidden by runoff from layers above. I flaked away the debris to get a better look and immediately started to find several spine fragments! I announced my excitement, "Cidarid spines!" Echinoid spines 5 cm echinoid spine in matrix A slightly elevated heart rate accompanied the anticipation of following signs in the rock. Then, I had an adrenalin spike when Bob called out, "You need to look at this." He walked toward me, and in his hand were 3 connected plates of our cidarid urchin quarry. I showed him some of the spines and explained the "hidden" layer we could focus on. I thought we were close to our treasure, and he asked if I had "covered" the area just to my right. I told him, "No, go ahead" as I knelt down for a look at some of the spines eroding from the ground. "JOHN!" I turned to see him stand up beside me with a golf ball-sized, knobby echinoid in his palm! "You did it!" I yelled. "You really...did it! Way to go!" We stood a moment, looking at the rare urchin with a range of emotions. Then, he handed me his prize while he went back to get his camera. I put it back in the spot he picked it from and took a few photos. When he came back, more photos ensued...it was an amazing Texas find! Although I know quite a few cidarid urchins have been found through the years, I am personally aware of just five...including Bob's - certainly not a common discovery. Checking a few references later indicated he had found a Phyllacanthus texanus! Bob's discovery Phyllacanthus texanus echinoid Well, as you can imagine, the adrenaline of discovery had us quickly back in search mode. More spines were found. I ravenously scanned the layer we isolated. Then, my "heart jumped in my throat" when I spotted the partial test (shell) of another Phyllacanthus! So close...but not this time. My Phyllacanthus texanus partial test Late into the fading light, we searched to no avail. The cool wind and darkness ended our efforts, and we congratulated each other with our goodbyes. Hopefully, with some weathering and heavy rain, we will get another chance to track the rare fossil urchins of the Glen Rose.
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