活跃的问题标记白垩纪-地球科学堆栈交换江南电子竞技平台江南体育网页版 最近30从www.hoelymoley.com 2023 - 07 - 10 - t20:52:49z //www.hoelymoley.com/feeds/tag/cretaceous https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/24000 2 墨西哥希克苏鲁伯撞击事件的时间 SeekingAnswers //www.hoelymoley.com/users/27166 2022 - 07 - 09 - t11:29:34z 2022 - 07 - 09 - t11:33:47z < p >有没有证据关于当地的墨西哥希克苏鲁伯撞击事件的时间(至少,撞击器是否发生在白天还是晚上)?< / p >

If there is not any such known evidence, then is there any known form/mechanism of scientific evidence that we might be able to find or examine that could reveal the local time of day?

 //www.hoelymoley.com/q/19178 6 什么导致了海平面下降在马斯特里赫特统时代? JohnWDailey //www.hoelymoley.com/users/4985 2020 - 02 - 11 - t14:21:41z 2020 - 02年- 13 - t10:36:01z < p >研究冰河时代每个人都知道,在过去的两年半的几百万年的地球的历史,也会有一段时间有足够的冰吸收大量的水。因此,平均海平面下降了100米。最著名的例子这种下降是波尼吉亚,就是大陆,北美与亚洲相连。然而,< / p > < p >似乎并没有减少海平面的唯一途径。下图是北美多少改变了只有不到一千万年的时间。< / p >

enter image description here

On the left is what North America looked like 75 million years ago. On the right is North America at the time the dinosaur empire fell nine million years later. It's not just North America that experienced this drop. As a matter of fact, the whole world was undergoing the same process (it's just that I couldn't find one compatible enough to post in this SE.)

The big deal with that is that unlike in the Ordovician, Carboniferous, Permian or Quaternary periods, this marine regression was not because of ice, as its extent (therefore its influence) was barely minimal--alpine at the very best. There was no massive pileup of polar ice as was the case in the other periods listed last sentence.

So if ice weren't the cause of the sea levels dropping during the latest Cretaceous age, then what else could cause the same thing to happen?

 //www.hoelymoley.com/q/17683 4 如果今天的地球变得温暖,它将如何与白垩纪的地球吗? 杰夫Grailet) //www.hoelymoley.com/users/17584 2019 - 08年- 07 - t15:55:09z 2019 - 08年- 08 - t03:24:42z < p >最悲观的场景对气候变化的预测全球温度上升几摄氏度在21世纪如果不采取行动。虽然这种转变温度等影响密封水平上升(由于冰的融化极地附近)和大规模灭绝事件,地球已记录时代过去比今天暖和,如< a href = " https://en.wikipedia.org/wiki/Cretaceous " rel = " nofollow noreferrer " > < / >白垩纪时期。提醒,白垩纪之前的最后一个地质时期恐龙的灭绝,这明显更高的海平面和温暖全球表面温度(4°C以上今天的表面平均温度)。< / p > < p >现在假设平均表面温度将上升为上述悲观预测的场景,而密封水平将大幅上升。< / p > < p >明天的地球如何(在这种情况下)比较白垩纪的地球吗?会用类似的国家(除了温度和海平面),甚至世界各地的气候相似,或将各种因素我没有提到(如空气中的氧气)的比率不同吗? < / p > //www.hoelymoley.com/q/16266 7 签名的酸雨KT边界 巴克刺 //www.hoelymoley.com/users/15191 2019 - 02 - 16 - t13:50:41z 2019 - 02年- 27 - t07:22:54z < p >我读Walter Alvarez用书霸王龙和厄运的火山口,地球与大流星的碰撞,在k - t大灭绝导致大气氧和氮分子的催化反应生成一氧化氮,从而形成高度腐蚀性的硝酸与水相结合。除了被认为影响挥发性中包含大量的硫无水石膏,进而形成硫酸。< / p >

This question refers to a thickness of $\pu{1.8m}$ for the section where iridium could be detected in the K-T boundary, suggesting that the resolution may be too low to note the effects of acid rain following the collision.

Is there evidence in the geological record of the formation of these acid species thought to be associated with the collision, say from deposits and/or effects of the ensuing acid rain?

 //www.hoelymoley.com/q/10075 3 在什么纬度/经度是康沃尔郡,英格兰7500万年前? 约旦 //www.hoelymoley.com/users/7872 2017 - 04 - 08 - t17:37:59z 2017 - 04 - 09 - t18:49:40z < p >接近白垩纪末期,地球上的位置(经度和纬度)是康沃尔郡,英国吗?. .约。< / p > //www.hoelymoley.com/q/3001 9 当恐龙漫游是火山活动更普遍? 波西米亚 //www.hoelymoley.com/users/1290 2014 - 12 - 10 - t01:19:05z 2015 - 03 - 26 - t08:49:26z < p >流行电影文化经常描绘了很多火山活动期间的恐龙。< / p >

Assuming "time of the dinosaurs" as the Jurassic (200 million years ago) until the end of the Cretaceous (66 million years ago):

Are there any geological theories that support such an assumption?

 //www.hoelymoley.com/q/2913 8 全球是如何Bonarelli大洋缺氧事件吗? plannapus //www.hoelymoley.com/users/87 2014 - 11 - 27 - t09:07:14z 2014 - 12 - 01 - t07:08:24z < p > Bonarelli事件(也称为OAE2)是“全球”的研究集中在Cenomanian-Turonian大洋缺氧事件边界(ca 94毫安)。它的特点是富含有机物的存在海洋沉积物和美元\ mathrmδ^ {\ C{13}} $转变。它被认为引发了一个小灭绝和大气和海洋温度上升。< / p > < p >我们有什么证据,缺氧确实是全球?< br >真的没有已知的海洋盆地沉积物生成时间间隔没有显示那些特有的黑色页岩? < / p >
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