普通话
古老的沉积物 600万年前，两个构造巨人--菲律宾海板块和欧亚板块相撞，启动了蓬莱造山运动，导致台湾岛从海洋中慢慢浮现。今天，在台湾的北海岸，向东中国海延伸的地方，像一个睡美人一样躺着一块长1.7公里、宽250米的纤细腰身的土地。野柳角，是野柳地质公园的所在地。这个占地仅24公顷的 "活的地质学教室 "赢得了全世界地质学家的高度赞扬。
就像树木每年的生长年轮一样，海底沉积物经过数百万年的积累而形成的岩层（层）见证了地球的演变。当地壳的强大运动将这些岩层推到海面之上时，它们可能会被风和海浪雕刻成新的形式--例如在新北市万里区的野柳暴露在人类面前的那些岩层
化石
当你在野柳地质公园漫步时，脚下清晰可见台湾特有的生物 "身体化石"，如 Astriclypeus yeliuensis 和 Echinodiscus yeliuensis，这两种来自中新世早期的 "沙美元 "海胆。其他生命迹象，如浅水海生物觅食或避难的洞穴，形成了珍贵的 "痕迹化石"。这些化石是在耶鲁的主要岩层中发现的，即大辽中新世地层的化石，其年代为2000万至2400万年前。
Astriclypeus yeliuensis
Astriclypeus aureus是一种不规则海胆，发现于西太平洋，包括台湾周围的水域。它是一个相对较大的物种，最大直径约为12厘米（4.7英寸）。身体是扁平的，大致呈圆形，有一个独特的图案，大而扁平的刺从圆盘形身体的中心向外辐射。刺的颜色是金黄色的，这也是该物种的通用名称。
Astriclypeus yeliuensis通常发现在浅水区，从潮间带到约30米（100英尺）的深度。众所周知，它出现在岩石和珊瑚礁栖息地，在那里它主要以藻类和其他小生物为食。
虽然Astriclypeus yeliuensis通常不会被收获供人食用或用于商业用途，但由于其独特的外观，它被收藏家和业余爱好者高度重视。然而，像许多海洋物种一样，它可能容易受到栖息地破坏和过度捕捞的影响，所以可持续地管理其种群是很重要的。
Echinodiscus yeliuensis
Echinodiscus yeliuensis是发现于西太平洋的海胆的一个物种。它于2013年首次被描述为从台湾北部的一个岬角----------------------耶柳海岸收集的标本。
Echinodiscus yeliuensis的身体呈圆盘状，直径可达20毫米（0.8英寸）。它有一个明显的刺的模式，从圆盘的中心辐射出去，长的刺和短的刺交替出现。刺上覆盖着小的小瘤，有一个扁平的、像桨一样的形状。Echinodiscus yeliuensis的颜色是可变的，可以从浅棕色到深紫色。
这个物种通常发现在浅水区，从潮间带到约30米（100英尺）的深度。众所周知，它出现在岩石和沙地的栖息地，以及珊瑚礁上。
与大多数海胆一样，Echinodiscus yeliuensis主要以藻类为食，利用其刺和管脚在底层移动和吃东西。它被认为没有重大的经济意义，尽管它可能在维持其栖息地的生态平衡方面发挥了作用。
要记录这个土坎。
- 在公园里找到一块尽可能完整的 "yeliuensis "化石，把你选择的化石的照片发给我，告诉我这是Astriclypeus yeliuensis还是Echinodiscus yeliuensis。解释一下你的答案。
- 你发现的化石的尺寸是多少（高、宽和直径）？
- 你认为这些化石的年龄有多大？
- 再给出3个沙尘暴化石的名称。
- 可选的。张贴一张你自己、GPS或个人物品和展示化石的照片。
一周后我没有收到回复的日志将被删除。
ENGLISH
Ancient sediments
Six million years ago, two tectonic giants—the Philippine Sea Plate and the Eurasian Plate—collided, kickstarting the Penglai Orogeny, a mountain-building process that caused the island of Taiwan to slowly emerge from the ocean. Today, on Taiwan’s North Coast, projecting into the East China Sea, there lies like a sleeping beauty a slender-bodied, slim-waisted swathe of land 1.7 kilometers long and 250 meters wide: Yeliu Cape, which is home to Yehliu Geopark. Covering a mere 24 hectares, this “living geology classroom” has won high praise from geologists worldwide.
Like the annual growth rings of trees, the strata (layers) of rock that are formed by the accumulation of sediment on the seabed over millions of years bear witness to the earth’s evolution. When powerful movements of the earth’s crust thrust these rock strata above the surface of the sea, they may be sculpted by the wind and the waves into new forms—such as those that are exposed to human view at Yeliu, in New Taipei City’s Wanli District.
Fossils
As you stroll in Yehliu Geopark, clearly visible underfoot are the “body fossils” of creatures unique to Taiwan, such as Astriclypeus yeliuensis and Echinodiscus yeliuensis, two species of “sand dollar” sea urchins from the early Miocene era. Other signs of life, like cavities where shallow-water sea creatures foraged or sheltered, have formed precious “trace fossils.” These fossils are found in Yeliu’s principal rock strata, those of the Daliao Miocene Formation, which dates from 20‡24 million years ago.
Astriclypeus yeliuensis
Astriclypeus aureus is a species of irregular sea urchin that is found in the western Pacific Ocean, including the waters around Taiwan. It is a relatively large species, with a maximum diameter of around 12 centimeters (4.7 inches). The body is flattened and roughly circular in shape, with a distinctive pattern of large, flattened spines that radiate out from the center of the disc-shaped body. The spines are golden-yellow in color, which gives the species its common name.
Astriclypeus aureus is typically found in shallow waters, ranging from intertidal zones down to depths of around 30 meters (100 feet). It is known to occur in rocky and coral reef habitats, where it feeds primarily on algae and other small organisms.
Although Astriclypeus aureus is not typically harvested for human consumption or used in commercial applications, it is highly valued by collectors and hobbyists due to its unique appearance. However, like many marine species, it may be vulnerable to habitat destruction and overfishing, so it is important to manage its populations sustainably.
Echinodiscus yeliuensis
Echinodiscus yeliuensis is a species of sea urchin that is found in the western Pacific Ocean. It was first described in 2013 from specimens collected off the coast of Yeliu, a headland in northern Taiwan.
The body of Echinodiscus yeliuensis is disc-shaped, with a diameter of up to 20 millimeters (0.8 inches). It has a distinct pattern of spines that radiate out from the center of the disc, with longer spines alternating with shorter ones. The spines are covered with small tubercles and have a flattened, paddle-like shape. The coloration of Echinodiscus yeliuensis is variable and can range from light brown to dark purple.
This species is typically found in shallow waters, ranging from intertidal zones down to depths of around 30 meters (100 feet). It is known to occur in rocky and sandy habitats, as well as on coral reefs.
As with most sea urchins, Echinodiscus yeliuensis feeds primarily on algae, using its spines and tube feet to move around and graze on the substrate. It is not considered to be of significant economic importance, although it may play a role in maintaining the ecological balance of its habitat.
To log this earthcache:
- Find in the park a 'yeliuensis' fossil as complete as possible and send me the photo of your chosen fossil and tell me whether it is an Astriclypeus yeliuensis or an Echinodiscus yeliuensis. Explain your answer.
- What are the dimensions of the fossil you found (height, width and diameter)?
- How old do you think these fossils are?
- Give 3 more names of sand dollar fossils.
- Optional: Post a photo of yourself, GPS or a personal item and showing the fossil.
You are welcome to log your answers straight away to keep your TB's and Stats in order but please message us with your answers within 1 week of your log. Cacher’s who do not fulfil the Earth Cache requirement will have their logs deleted.
Source
https://nspp.mofa.gov.tw/nsppe/news.php?post=142415
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