https://jeffrey-martz.squarespace.com/home daily 0.75 2026-02-18 https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1499715809226-4BCI34SG28RAMLOAFOKJ/170518_6.JPG Home https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1500139523735-0I43D72OP3MKPLQ0XFP2/image-asset.jpeg Home https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1500138936809-2LSL0QNQ2IH7RVD17H31/tumblr_mn8b8sLRb61rkz363o1_1280.jpg Home https://jeffrey-martz.squarespace.com/teaching daily 0.75 2026-04-03 https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1775181823046-CZFHARU49CDECLV71KEG/IMG_5875.jpg Education https://jeffrey-martz.squarespace.com/research daily 0.75 2022-01-01 https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513809194798-Q3WQH984A1DBEZA0EQGV/160525_5a.JPG Research - BURR TRAIL, MAY 2016 The Chinle Formation along Burr Trail at the Circle Cliffs, in Grand Staircase-Escalante National Monument, southern Utah. From the bottom to the top are the Monitor Butte Member (gray, purple, and the lowest red bed), the Petrified Forest Member (red and orange beds), and the Owl Rock Member (the pastel-colored beds). The cliffs capping the section is the Wingate Sandstone. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513809228702-A3S8H5KX837XPFOQ46SP/160525_14f.JPG Research - CIRCLE CLIFFS, MAY 2016 Two UH-D students at the top of the Chinle Formation, just below the Wingate Sandstone. Circle Cliffs near Burr Trail. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513809269547-FRSA22SL850J14VOCWCA/160804_17a.JPG Research - LAKE POWELL, AUGUST 2016 Lake Powell is the heart of Glen Canyon National Recreation Area in southern Utah. These Chinle Formation exposures are only accessible by boat. The big orange boulders are pieces of the Wingate Sandstone rolling down the side of the hill. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513809315624-VAXMT2WFBPZWUVL95E4U/160804_18c.JPG Research - LAKE POWELL, AUGUST 2017 Cliffs of Wingate Sandstone along Lake Powell. The Wingate is an eolian sandstone, formed by wind-blown sand dunes during the Jurassic Period about 200 million years ago. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513809398354-VVR2KITJ2RO3GFY57EDK/P5200041.JPG Research - CIRCLE CLIFFS, MAY 2017 Looking for fossils at the Circle Cliffs at Grand Staircase-Escalante National Monument. Fossils are rare, and usually scattered fragments weathering out of sandstones and mudstones. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513812083783-XDD0RMYTA5VDYDXUT7N9/160524_32f.JPG Research - Petrified Log, Grand Staircase-Escalante National Monument Giant conifer logs in the Chinle Formation at the Wolverine Petrified Forest in Grand Staircase-Escalante National Monument. These trees are preserved by dissolved silica that soaked into the wood, converting the wood into a mineral. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513812141884-I9UOVR76APEUJCOKJYKW/170524_2a.JPG Research - Aetosaur Quarry, Northern Arizona The Typothorax quarry near Petrified Forest National Park. As the skeletons are exposed, they are covered with a cap of plaster to protect them. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513812193457-HQJ3GAWNFGRD6ZWRG1IP/170528_2b.JPG Research - Aetosaur osteoderm A Typothorax osteoderm (armor plate) at the quarry. Modern crocodiles and alligators also have bony armor plates like these, but in aetosaurs they are especially large. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513826507936-QLCGR88JHTPOA88GI4Z6/Typothorax.jpg Research - Life Reconstruction of an Aetosaur The aetosaur Typothorax. The osteoderm in the previous image probably came from the front part of the body. https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1513875505957-TBBIZRA2E4XKH33LZB0I/image-asset.jpeg Research - Giant Horsetail, Southern Utah A giant horsetail fossil in southern Utah, still in the position it was growing in. Horsetails are relatively primitive plants that today grow no more than a few centimeters in diameter. Massive forms like this one flourished during the Paleozoic Era and the Triassic Period. The stems are hollow, and fill up with sediment when the horsetail dies and is buried, creating a natural mold of the inside of the stem.   https://jeffrey-martz.squarespace.com/links daily 0.75 2026-04-03 https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1499716681720-8HBEJWHWF6RW7PI3J1ZL/Formation+of+the+Mill+Canyon+Dinosaur+Track+Site.jpg Links https://jeffrey-martz.squarespace.com/new-page daily 0.75 2026-04-03 https://images.squarespace-cdn.com/content/v1/58e54638725e2509a65652b8/1500170309339-58W67SH1K71WC2BD6EM2/Vancleavea+skeleton+%28reduced%29.jpg Publications https://jeffrey-martz.squarespace.com/student-resources daily 0.75 2021-04-15