This paper presents preliminary results of paleoclimatic signatures of conifer woods during the deposition of the basal Crato and topmost Romualdo members of the Santana Formation within the Tropical Equatorial Hot Arid Belt (late Aptian, Araripe Basin, Brazil). Analysis was carried out using standard thin sections, and the anatomical details were studied in transmitted light. The wood growth pattern from the lowermost laminated lacustrine carbonate level of the Crato Member was characterized by the absence of true growth rings and the common presence of wood growth interruptions, and could be linked to a tropical, equable but erratically humid environment. In an interlayered fine-to-coarse sandstone level attributed to a fluvio-deltaic interval, the wood growth pattern was homogeneous, lacking true growth rings, with weakly delineated growth interruptions over long radial distances. In this level the growth pattern could be related with a transition to a more equable tropical climate during a relatively humid period. In contrast, the wood pattern from the carbonate succession of the uppermost Romualdo Member, interpreted as a lagoon area with marine influence, showed true growth rings with abrupt ring boundaries and rings of variable width, also including frequent growth interruptions. This pattern could be linked to a monsoonal-like climate, subjected to distinct cyclical conditions and periodical droughts during the growing season.

本文介绍了热带赤道热干旱带（巴西阿拉里佩盆地阿普蒂安晚期）内的基底克拉托和桑塔纳组最顶端的罗穆阿尔多成员沉积期间针叶树古气候特征的初步结果。使用标准薄片进行分析，并在透射光下研究解剖细节。Crato 成员最低层状湖相碳酸盐层的木材生长模式的特点是没有真正的年轮和木材生长中断的普遍存在，并且可能与热带、均衡但不规则潮湿的环境有关。在归因于河流三角洲间隔的夹层细砂岩水平，木材生长模式是均质的，缺乏真正的年轮，在长径向距离上有弱描绘的生长中断。在这个水平上，生长模式可能与在相对潮湿的时期过渡到更平等的热带气候有关。相比之下，被解释为受海洋影响的泻湖区的最上层 Romualdo 段碳酸盐岩层序的木材模式显示出真正的年轮，其年轮边界陡峭，年轮宽度可变，还包括频繁的生长中断。这种模式可能与类似季风的气候有关，在生长季节受到明显的周期性条件和周期性干旱的影响。来自最上层 Romualdo 段碳酸盐岩层序的木材图案被解释为受海洋影响的泻湖区，显示出真正的年轮，具有陡峭的年轮边界和可变宽度的年轮，还包括频繁的生长中断。这种模式可能与类似季风的气候有关，在生长季节受到明显的周期性条件和周期性干旱的影响。来自最上层 Romualdo 段碳酸盐岩层序的木材图案被解释为受海洋影响的泻湖区，显示出真正的年轮，具有陡峭的年轮边界和可变宽度的年轮，还包括频繁的生长中断。这种模式可能与类似季风的气候有关，在生长季节受到明显的周期性条件和周期性干旱的影响。