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historicalmarkerproject/markers/HM1AZE_a-canvas-for-ideas_Chambers-AZ.html
The dark coating on the boulder below you is desert varnish - a concentration of mineral, clay, and organic material that accumulates over time. Prehistoric artists created rock art by exposing the lighter material underneath. But what do these sy…
historicalmarkerproject/markers/HM1AZC_summer-solstice-marker_Chambers-AZ.html
A solstice is an astronomical event that happens twice annually as the Sun reaches its highest or lowest point in the sky. Here in the Northern Hemisphere, June 20th is usually the longest day of the year and is referred to as the summer solstice.…
historicalmarkerproject/markers/HM1AZB_life-in-the-village_Chambers-AZ.html
Did you notice where the trail passed over the faint outlines of the rooms? Over 100 rooms formed a one-story apartment complex surrounding a central plaza in the village. The building materials for the pueblo were blocks of native sandstone, shap…
historicalmarkerproject/markers/HM1AZ5_village-on-the-rio-puerco_Chambers-AZ.html
The village on the Rio Puerco (Puerco Pueblo) is a prehistoric settlement built of shaped sandstone blocks by ancestral Puebloan people. It was inhabited between A.D. 1250 and 1380. At its peak the pueblo had over 100 rooms, with a possible popula…
historicalmarkerproject/markers/HM1AYY_newspaper-rock_Petrified-Forest-National-Park-AZ.html
More than 650 images adorn the boulders below - one of the largest concentrations of petroglyphs in the park. People who farmed the Puerco River Valley 650 to 2,000 years ago pecked these petroglyphs onto the rocks, leaving a legacy etched in ston…
historicalmarkerproject/markers/HM1AYX_pioneers-of-paleontology_Chambers-AZ.html
Petrified Forest is a laboratory where scientists study not only the fossil record, but the records of earlier discoveries by naturalists and paleontologists.
Interest in the area's fossils goes back to 1853, when a U.S. Army expedition discove…
historicalmarkerproject/markers/HM1AYW_agate-bridge_Petrified-Forest-National-Park-AZ.html
Centuries of scouring floodwaters washed out the arroyo, or gully, beneath this 110-foot (34 meter) petrified log to form Agate Bridge. The stone log, harder than the sandstone around it, resisted erosion and remained suspended as the softer rock …
historicalmarkerproject/markers/HM1AYV_jasper-forest_Petrified-Forest-National-Park-AZ.html
The petrified wood strewn in the valley below was once encased in the bluffs around you. When erosional forces removed the softer rocks, the petrified wood tumbled and accumulated on the valley floor. Once filled with fallen logs, Jasper Forest wa…
historicalmarkerproject/markers/HM1AYU_from-wood-to-stone_Petrified-Forest-National-Park-AZ.html
Approximately 225 million years ago, during the Triassic Period, a floodplain existed here - littered with fallen trees. Periodic flooding buried the logs beneath layers of silt. Over time, silica-laden waters filtered through these deposit and pe…
historicalmarkerproject/markers/HM1AYS_triassic-landscape_Petrified-Forest-National-Park-AZ.html
The dry plateau lands of this region today are far different from the tree-littered floodplains of 225 million years ago during the geologic period called the Triassic. Imagine a forested Triassic land where crocodile-like phytosaurs inhabited the…