graptolites

简明释义

英[ˈɡræp.tə.laɪts]美[ˈɡræp.təˌlaɪts]

笔石类

英英释义

单词用法

同义词

反义词

例句

1.Between one edge of the three-foot-thick gray band and the other, some 80 percent of marine species died out, many of them the sorts of creatures, like graptolites, that no longer exist.

在约1米厚的灰色岩石带子的各个带层之间，约80%的海洋物种灭绝了，其中许多是生物物种，象笔石动物，再也不会在这个世界上存在了。

2.Between one edge of the three-foot-thick gray band and the other, some 80 percent of marine species died out, many of them the sorts of creatures, like graptolites, that no longer exist.

在约1米厚的灰色岩石带子的各个带层之间，约80%的海洋物种灭绝了，其中许多是生物物种，象笔石动物，再也不会在这个世界上存在了。

3.During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.

在奥陶纪，大多数生命都生活在海洋里，所以海洋生物，例如三叶虫、腕足类动物与笔石动物的数量在此时急剧减少。

4.The fossils of graptolites 藤虫 are crucial for understanding the geological history of the Paleozoic era.

藤虫的化石对理解古生代的地质历史至关重要。

5.Scientists often use graptolites 藤虫 as index fossils to date sedimentary rock layers.

科学家们常常使用藤虫作为指示化石来确定沉积岩层的年代。

6.In paleontology, graptolites 藤虫 are significant due to their rapid evolution and widespread distribution.

在古生物学中，藤虫因其快速进化和广泛分布而具有重要意义。

7.The study of graptolites 藤虫 helps geologists reconstruct ancient marine environments.

对藤虫的研究帮助地质学家重建古代海洋环境。

8.Many graptolites 藤虫 species thrived in the oceans during the Ordovician period.

许多藤虫物种在奥陶纪期间在海洋中繁盛。

作文

The study of ancient life forms provides a fascinating glimpse into the history of our planet. Among these intriguing organisms are the graptolites, which were colonial animals that thrived in the oceans during the Paleozoic era, particularly from the Cambrian to the Devonian periods. Understanding graptolites is essential for paleontologists as they serve as important index fossils, helping scientists to date and correlate the age of rock layers. Graptolites were primarily composed of a series of tiny, tube-like structures known as thecae, which housed individual zooids. These zooids were capable of feeding and reproducing, contributing to the growth of the colony. The unique morphology of graptolites allows researchers to identify different species, which can indicate specific geological timeframes. This makes them invaluable for stratigraphy, the branch of geology concerned with the order and relative position of strata and their relationship to the geological time scale. Fossilized graptolites are commonly found in shale deposits, where they have been preserved over millions of years. Their delicate structures can be challenging to find, but when discovered, they provide crucial information about the marine environments of the past. The presence of certain graptolites can suggest the conditions of ancient seas, including temperature, depth, and salinity, offering insights into how these ecosystems functioned long ago. Moreover, the extinction of graptolites at the end of the Devonian period marks a significant event in Earth's history. This extinction event, often associated with drastic environmental changes, had profound effects on marine biodiversity. By studying the decline of graptolites, scientists can better understand the factors that contribute to mass extinctions and the subsequent recovery of ecosystems. In addition to their scientific importance, graptolites also capture the imagination of those who study them. Their intricate shapes and patterns reveal the complexity of life in ancient oceans, and they remind us of the vast diversity of life that has existed on Earth. For students and enthusiasts alike, learning about graptolites can inspire a deeper appreciation for paleontology and the evolutionary history of life. In conclusion, graptolites are more than just fossils; they are key indicators of geological time and environmental conditions in the ancient past. Their study not only enhances our understanding of prehistoric life but also sheds light on the processes that have shaped our planet's history. As we continue to explore the mysteries of the past, graptolites will undoubtedly remain a focal point for research and discovery in the field of paleontology.

对古代生命形式的研究为我们提供了对地球历史的迷人洞察。在这些引人入胜的生物中，有graptolites，它们是繁盛于古生代海洋中的群居动物，特别是在寒武纪到泥盆纪时期。理解graptolites 对古生物学家至关重要，因为它们作为重要的指标化石，帮助科学家确定和关联岩层的年龄。 Graptolites 主要由一系列微小的管状结构组成，称为thecae，里面容纳着个体的zooids。这些zooids能够进行摄食和繁殖，促进群体的生长。Graptolites 独特的形态使研究人员能够识别不同的物种，这可以指示特定的地质时间框架。这使它们在地层学中极具价值，地层学是地质学的一个分支，关注岩层的顺序和相对位置及其与地质时间尺度的关系。 化石化的graptolites 通常在页岩沉积物中发现，它们在数百万年间得以保存。它们精致的结构可能很难找到，但一旦发现，它们就提供了关于过去海洋环境的重要信息。某些graptolites 的存在可以暗示古代海洋的条件，包括温度、深度和盐度，提供了对这些生态系统如何在很久以前运作的见解。 此外，graptolites 在泥盆纪末期的灭绝标志着地球历史上的一个重要事件。这次灭绝事件通常与剧烈的环境变化有关，对海洋生物多样性产生了深远的影响。通过研究graptolites 的衰退，科学家可以更好地理解导致大规模灭绝的因素以及生态系统随后的恢复。 除了科学重要性，graptolites 还吸引着那些研究它们的人的想象力。它们复杂的形状和图案揭示了古代海洋生命的复杂性，并提醒我们地球上曾经存在的广泛生命多样性。对于学生和爱好者来说，了解graptolites 可以激发对古生物学和生命进化历史的更深刻欣赏。 总之，graptolites 不仅仅是化石；它们是古代过去地质时间和环境条件的关键指标。它们的研究不仅增强了我们对史前生命的理解，还揭示了塑造我们星球历史的过程。当我们继续探索过去的奥秘时，graptolites 无疑将继续成为古生物学研究和发现的焦点。