File:Daemonelix burrows, Agate Fossil Beds.jpg
原始檔案 （2,196 × 1,329 像素，檔案大小：539 KB，MIME 類型：image/jpeg）
摘要
| 描述 |
Daemonelix burrows, Miocene of Nebraska, USA (original vintage photo owned by the University of Nebraska; photo provided here, for geoscience education purposes, courtesy of Agate Fossil Beds National Monument). Daemonelix burrows are commonly called “Devil’s corkscrews”. These distinctive, large, spiral burrows were made by an ancient species of terrestrial beaver. The spiraled portion of these trace fossils is usually about 1.5 to 2 meters tall. The base of the spiraled portion merges with a subhorizontal tube. The burrows are filled with siliciclastic sediments that are better cemented compared with surrounding materials. Stratigraphy: paleosol in the Harrison Formation, upper Middle Miocene Locality: Agate Fossil Beds National Monument, northwestern Nebraska, USA Trace fossils are any indirect evidence of ancient life. They refer to features in rocks that do not represent parts of the body of a once-living organism. Traces include footprints, tracks, trails, burrows, borings, and bitemarks. Body fossils provide information about the morphology of ancient organisms, while trace fossils provide information about the behavior of ancient life forms. Interpreting trace fossils and determination of the identity of a trace maker can be straightforward (for example, a dinosaur footprint represents walking behavior) or not. Sediments that have trace fossils are said to be bioturbated. Burrowed textures in sedimentary rocks are referred to as bioturbation. Trace fossils have scientific names assigned to them, in the same style & manner as living organisms or body fossils. |
| 日期 | 15:30. Historic photo, circa late 19th or early 20th century. |
| 來源 | Daemonelix burrows (Harrison Formation, Middle Miocene; Agate Fossil Beds National Monument, northwestern Nebraska, USA) |
| 作者 | James St. John |
授權條款
- 您可以自由：
- 分享 – 複製、發佈和傳播本作品
- 重新修改 – 創作演繹作品
- 惟需遵照下列條件：
- 姓名標示 – 您必須指名出正確的製作者，和提供授權條款的連結，以及表示是否有對內容上做出變更。您可以用任何合理的方式來行動，但不得以任何方式表明授權條款是對您許可或是由您所使用。
|
這幅圖片原始出處為Flickr的https://www.flickr.com/photos/47445767@N05/15545351982 ，作者為jsj1771 。經機器人FlickreviewR在2014年十一月28日審查後確定為採用cc-by-2.0的協議授權使用。 |
 |
|
 |
 |
檔案歷史
點選日期/時間以檢視該時間的檔案版本。
| 日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
|---|---|---|---|---|---|
| 目前 | 2014年11月28日 (五) 15:05 | | 2,196 × 1,329（539 KB） | Tillman | Transferred from Flickr via Flickr2Commons |
檔案用途
下列頁面有用到此檔案：
全域檔案使用狀況
以下其他 wiki 使用了這個檔案：
- en.wikipedia.org 的使用狀況
- en.wikiversity.org 的使用狀況
- it.wikipedia.org 的使用狀況
- sv.wikipedia.org 的使用狀況
