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This week, we’re covering the Madeira Island Ultra-Trail. Read our in-depth preview and, then, follow our live race coverage this weekend!

A large ammonite fossil located right on the Hot Springs Trail.

Published on October 26, 2010 in Trail Running in Big Bend National ParkFull resolution (156 × 199)

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ammonite fossil

An ammonite fossil located on the Hot Springs Trail.

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Ultrarunning & Trail Running Resources

Ultrarunning Basics: The Ultimate Guide to Ultramarathon Training! Training for Your First Ultra Newcomers Guide to Ultramarathons Finding Trails Choosing an Ultra Finding an Ultra Pace Nutrition Basics for Trail Running Ultramarathon Clubs Ultramarathon Coaches Guide to Fastpacking Ultrarunning Films International Resources
Training Tips: Newcomers Guide to Ultras Ultra Training for Busy People Ultra Training Volume Endurance-Based Workouts The Importance of the Long Run Runner Strength Training Building a Trail Worth Body Series Descending on Trails Dominate the Downhills Quad Muscle Training Understanding Training Stress Our Performance Mobility Series Best Runner Exercise (No One Is Doing) Altitude Training Dynamic Core Stability Troubleshooting on the Run 10 Rules for Recovery Six Tests for Runners Stride Cues and Running Efficiency Six Things Elites Do
Running Injuries: Running Injury Article Roundup Remodel Injured Tissue Chemical Stress and Running Injury The Concept of Pain in Running Injuries Is Your Running Injury Nerve Pain? Pain Management for Runners Beat Achilles Pain Recover from Plantar Fasciitis Cure Plantar Fasciitis Treat Hamstring Pain Address Lower Back Pain High Ankle Sprains Hip Stability Injury Test
Sports Medicine: The Science of Altitude Acclimation The Science of Heat Acclimation Dealing with Sore Quads Running When Sick Sleep and Running Performance Overtraining Syndrome New Hydration Paradigm Running and Cramps Overcome Running Cramps Running During Pregnancy Non-Asthma Breathing Problems Vision Loss in Ultramarathons Type II Diabetes from Ultrarunning? Rhabdomyolysis and Ultramarathons Running's Effect on the Heart

Trail Running Gear Reviews

Trail Running Shoes: Best New Trail Shoes Late 2017 Best New Trail Shoes Early 2018 Best New Trail Shoes Late 2018 Heel-to-Toe Drop Altra Superior 3.5 Altra Timp Brooks Caldera Columbia Montrail Caldorado III Hoka One One Challenger ATR 3 Hoka One One EVO Mafate Inov-8 Trailroc 285 Inov-8 Roclite 305 La Sportiva Akasha La Sportiva Bushido La Sportiva Lycan New Balance Leadville 3 New Balance Summit Unknown Nike Zoom Air Terra Kiger 4 Nike Zoom Wildhorse 4 Salomon S-Lab Sense Ultra Salomon S-Lab Ultra Salomon Speedcross 4 Salomon Speedcross Pro Saucony Peregrine 8 SCARPA Spin RS Topo Athletic MT 2 & Ultrafly
Other Trail Running Gear: Best New Gear Early 2017 Best New Gear Late 2017 Lightweight Running Packs Running Cap Comparison Featherweight Jackets Gore-Tex Shakedry Jackets Men's Ultrarunning Shorts Review Nathan VaporHowe 4L Race Vest Nathan VaporKrar 4L Race Vest Raidlight Gilet Responsiv 10L Vest Salomon S-Lab Sense Ultra 8 Set UltrAspire Alpha 3.0 Vest Jaybird Run Wireless Headphone

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