Increased sedimentation rates and grain sizes 2-4 Myr ago due to the influence of climate change on erosion rates.

Around the globe, and in a variety of settings including active and inactive mountain belts, increases in sedimentation rates as well as in grain sizes of sediments were recorded at approximately 2-4 Myr ago, implying increased erosion rates. A change in climate represents the only process that is globally synchronous and can potentially account for the widespread increase in erosion and sedimentation, but no single process-like a lowering of sea levels or expanded glaciation-can explain increases in sedimentation in all environments, encompassing continental margins and interiors, and tropical as well as higher latitudes. We suggest that climate affected erosion mainly by the transition from a period of climate stability, in which landscapes had attained equilibrium configurations, to a time of frequent and abrupt changes in temperature, precipitation and vegetation, which prevented fluvial and glacial systems from establishing equilibrium states.

Development and psychometric properties of the Student Worry Questionnaire-30.

Described are the development and initial psychometric properties (Ns = 50 and 188) of a self-report measure, the Student Worry Questionnaire-30, for use with college undergraduates. Exploratory principal components analyses (Ns = 388, 350, and 396) with oblimin rotation indicated six domains of worrisome thinking, financial-related concerns, significant others' well-being, social adequacy concerns, academic concerns, and general anxiety symptoms. The total score and scale scores showed internal consistency of .80 to .94. Also, test-retest reliability analyses (.75 to .80) support consistency of responses over 4 wk. Strong evidence for convergent validity) was indicated. Confirmatory factor analysis confirmed the fit of the 6-factor oblique model. Limitations of the present studies, and directions for research are discussed.

The Reasons for Living Inventory for Adolescents (RFL-A): development and psychometric properties.

The role of adaptive beliefs and attitudes against suicide has not been given adequate attention in the clinical or assessment literature. This article reports on the development and initial psychometric properties of a 32-item self-report inventory, the Reasons for Living Inventory for Adolescents (RFL-A). In Phase 1, we used exploratory and confirmatory factor analyses to identify five correlated factors: Future Optimism, Suicide-Related Concerns, Family Alliance, Peer Acceptance and Support, and Self-Acceptance. In Phase 2, we cross-validated the 5-factor oblique model in a different group of adolescents recruited from two high schools. In addition, we examined evidence for convergent, discriminant, and construct validities. The coefficient alpha indices for the RFL-A total and scales were satisfactory. In Phase 3, we evaluated additional evidence of reliability and validity using samples of high school and psychiatric inpatient adolescents. The results suggest that the RFL-A is a short, reliable, and valid measure that is potentially useful in the assessment of adolescent suicidal behavior.

Relationships between experiences of parental violence during childhood and women's self-esteem.

The interrelationships between experience of parental verbal aggression and physical violence during childhood and the development of low self-esteem during adulthood were explored separately for the father-daughter and mother-daughter relationships. Data were collected from 472 women between the ages of 18 and 45 during in-depth interviews drawn from five sources: outpatient alcoholism treatment, DWI (Driving While Intoxicated) education programs, shelter for battered women, outpatient mental health treatment, and randomly from the community. Control variables included respondents' alcohol problems and help-seeking behavior, parental alcohol problems, number of changes in childhood family (e.g., divorce), and respondents' race and social class. Controlling for these variables, experiences of father-to-daughter verbal aggression, moderate violence, and severe violence were found related to lower self-esteem in adulthood for women. Conversely, controlling for these variables, experiences of mother-to-daughter verbal aggression, moderate violence, and severe violence were not found related to lower self-esteem in adulthood for women.

Childhood maltreatment and the risk of substance problems in later life.

This paper examines the risk of developing problems in adolescence and adulthood, particularly those associated with substance use, as a consequence of experiencing physical or sexual abuse during childhood. We review both retrospective and prospective research, conducted with both adolescent and adult respondents. Although there are some marked discrepancies in the findings from retrospective and prospective studies, these are probably due to differences in methodology, particularly between using official records and self-report to identify cases of abuse. Despite the wide range of methodologies and samples used in these studies, most indicate that the experience of childhood abuse is a risk factor for a number of common mental disorders in adolescence and adulthood, including alcohol and drug-related problems. In many cases, the experience of abuse appears to lead in later life to increased feelings of depression and anxiety which, while not sufficient to result in the diagnosis of a mental health disorder, place the victims at greater risk of developing substance problems. Multivariate studies indicate that this positive association remains even when controlling for important variables such as the presence of parental alcohol problems. The paper concludes with a number of recommendations for future research, so that it can be established whether the risk arises specifically from child abuse or neglect, or from the more general impact on child development of adverse family relationships.

Control theory, labeling theory, and the delivery of services for drug abuse to adolescents.

This article uses panel data and multiple regression of follow-up on baseline variables to test hypotheses that over time: (1) control theory variables are related to decreases in drug use and to each other, (2) labeling theory variables regarding drug use are related to increases in drug use, increases in each other, and negatively to control theory variables, (3) participation in a nonsystem juvenile justice diversion program is related to an increase in drug use, more deviant self-labels, and weaker societal bonds, and (4) the effects of the diversion program differ across gender of respondent. Baseline and follow-up data were collected on a randomly selected comparison group of adolescents (N = 100, 46 females) and a diversion program sample of adolescents (N = 88, 46 females). Slope differences across samples were tested using interaction terms. Where significant interaction terms were found, additional separate sample regression equations were performed. All four hypotheses received some support.

Alcohol, drugs, and violence in children's lives.

This chapter reviews the current state of knowledge concerning the interrelationship between the cycle of alcohol and other drugs (AOD) use and the cycle of violence. This issue is framed in terms of two questions. The first is the extent to which AOD use by the perpetrator is related to the perpetration of violence toward children, defined here as including both physical and sexual abuse. The second question is whether the experience of abuse during childhood is related to the subsequent development of the abuse of alcohol and other drugs. The review indicates that parental AOD abuse is related to physical and sexual abuse. However, because most perpetrators are not parents, the relationship is not yet clear. The data do support the link between experiencing childhood violence and the development of later AOD abuse. Theoretical explanations for each link are reviewed and mediating variables are identified. The review concludes with a presentation of methodological issues and the directions for future research.

Violent victimization among women with alcohol problems.

Empirical evidence regarding the role of childhood victimization in the development of women's alcohol problems is examined in this chapter. In particular, childhood sexual abuse and father-to-daughter violence are found to predict later alcohol problems. Key variables that link experiences of childhood victimization and the development of adult alcohol problems are identified. Strengths and weaknesses of the research provide a better assessment of our confidence in the empirical evidence to date. Possible explanations for how and why the experiences of violent victimization may lead to women's alcohol problems are presented. Finally, important directions for policymakers, clinicians, and researchers are discussed.

Interrelationships between victimization experiences and women's alcohol use.

The interrelationships between experiences of childhood victimization and the development of women's alcohol-related problems are explored. Two different forms of childhood victimization are examined: (1) parent-to-child violence and (2) childhood sexual abuse (familial and nonfamilial). Data were collected from 472 women between the ages of 18 and 45 during in-depth interviews. Women were grouped to allow for the following two sets of comparisons: comparison 1: alcoholics in alcoholism treatment (n = 98), drinking drivers (n = 100) and a household sample (without alcohol problems) (n = 82); comparison 2: women with alcohol problems in treatment (n = 178), women without alcohol problems in treatment (n = 92) and a household sample (n = 82). High rates of childhood victimization for women with alcohol problems suggest that there is a link between victimization and the development, specifically, of women's alcohol problems. The strength of the interrelationships between childhood victimization and the development of women's alcohol problems when holding the treatment condition constant is of particular interest in this study. The rates of childhood victimization were significantly greater for women with alcohol problems in treatment as compared to women without alcohol problems in treatment. Thus, even when holding the treatment condition and family background variables constant, childhood victimization has a specific connection to the development of women's alcohol problems. These findings remained significant even when controlling for demographic and family background differences, including parental alcohol problems.

The moderating impact of social support following childhood sexual abuse.

The role of social support in moderating the impact of childhood sexual abuse on adult psychological adjustment was examined. Subjects included 475 women, age 18-45, some of whom were currently receiving treatment, others who were not. Women in the treatment group were receiving therapy for either alcoholism, for being battered, or for mental health problems. The comparison group was drawn from two sources: a random household sample and a sample of women attending drinking driver classes. Among both groups, women who had been sexually abused exhibited more psychological symptoms and lower self-esteem compared to those who were not abused. Latency of disclosure of childhood sexual abuse had no impact on long-term consequences of the abuse for either the treatment or the comparison group. However, among women in the comparison group, those who experienced supportive reactions following disclosure of sexual abuse had fewer psychological symptoms and somewhat higher self-esteem relative to those who did not receive support. Social support had no apparent effect on the long-term adjustment of women in the treatment group. Possible explanations for this pattern and directions for future research are discussed.

The relationship of adolescent peer groups to the incidence of psychosocial problems.

This study combined a treatment sample (n = 127) and a control sample (n = 114) of adolescents (ages 13-17) to investigate the relationship between adolescent peer groups and incidence of psychosocial problems. A content analysis resulted in four separate types of peer groups. The group with the lowest level of involvement in school activities was labeled by other adolescents in negative terms. An analysis of variance indicated that the least involved and most negatively labeled group generally had the most positive attitudes toward alcohol and drug use, the lowest levels of perceived harm due to alcohol and drug use, and the highest levels of alcohol abuse, drug use, delinquency, and depression. This group also had the lowest level of self-esteem, most external locus of control, least perceived access to occupational opportunities, and highest level of societal estrangement. The results are interpreted as providing support for both control and labeling theories. Implications for theory-based intervention are discussed.

Spousal violence among alcoholic women as compared to a random household sample of women.

The purpose of this study is to examine the relationship between spousal violence and women's alcoholism problems. This study compares two samples: (1) 45 alcoholic women selected from local treatment agencies and Alcoholics Anonymous groups and (2) 40 nonalcoholic women selected randomly from households. Two-hour interview schedules were administered to both samples. The Conflict Tactics Scale was used to assess spouse-to-woman violence. Alcoholic women were found to have higher levels of spouse-to-woman negative verbal interaction, moderate violence and severe violence as compared to the household women. Multivariate analyses revealed that spouse violence scores were strong predictors of type of sample. This was true even after controlling for presence of alcohol problems in the spouse, income, parental violence, parental alcohol problems and changes in parental family. These findings suggest that alcoholism treatment programs should screen for spousal violence among women alcoholics and that victims of spousal violence should be screened for alcohol-related problems.

Mammal-like dentition in a mesozoic crocodylian.

Crocodylian teeth are generally conical with little differentiation in shape along the tooth row. The mandible is incapable of any fore-aft movement, and feeding typically involves little or no intraoral processing. Complex, multi-cusped, mammal-like teeth differentiated along the tooth row have been found in a Cretaceous crocodylian from Malawi. The morphology of the teeth and mandible indicates that food items were processed by back-to-front (proal) movement of the mandible, unlike living crocodylians but as in some mammals and Sphenodon (the tuatara).

The nature of the association between parental rejection and delinquent behavior.

A panel design with approximately 300 adolescents was employed to investigate the relationship between parental rejection and delinquency. Previous studies have failed to control for potentially confounding family factors and have ignored the possibility that the causal priority is from delinquency to parental rejection, rather than the reverse. Parental rejection continued to show a moderate association with delinquency after relevant controls were introduced. The results were the same across sexes. LISREL was employed to estimate the parameters of the reciprocal relationship between parental rejection and delinquency. Analysis indicated that the predominant causal flow is from parental rejection to delinquency.

A panel study of normative structure, adolescent alcohol use and peer alcohol use.

Panel data and multiple regression of follow-up data on baseline data are used to explore direction of relationship among normative structure, adolescent alcohol use and peer alcohol use. Baseline and follow-up data were collected on a random sample of 100 adolescents (54 males). Two separate measures of each of the six variables--Adolescent Alcohol Involvement Scale (AAIS), Quantity-Frequency Index (QF), close friend drinking level, other friend drinking level, perceived harm due to alcohol use and attitudes toward alcohol--were used. The relationship between adolescent self-drinking and peer alcohol use was found to be reciprocal, complex and limited to close friends. Baseline AAIS predicted follow-up close friend drinking level, but baseline QF Index did not. Baseline close friend drinking level predicted follow-up QF Index but not follow-up AAIS. Normative structure toward alcohol was found to be stable over time and unrelated to baseline self or peer alcohol use. Baseline perceived harm due to alcohol use predicted follow-up QF Index, indicating that adolescents adjust behavior to prior attitudes.

The role of childhood sexual abuse in the development of alcoholism in women.

The effects of childhood sexual abuse on the development of alcoholism in women were examined by comparing a sample of 45 alcoholic women selected from local treatment agencies and Alcoholics Anonymous groups with a group of 40 nonalcoholic women selected randomly from a household population. Face-to-face interview schedules were administered to both samples. Sexual abuse was defined as any unwanted sexual contact with a person at least five years older than the respondent, or with any family relative, regardless of age difference. Types of sexual contact included both nonphysical contact (e.g., invitations, exposure) and physical contact (e.g., fondling, intercourse). Results showed that alcoholic women were more likely to have experienced sexual abuse, had a greater number of different types of sexual abuse experiences, and endured sexual abuse over a longer period than the comparison group. The presence of any childhood sexual abuse experience was sufficient to discriminate between the alcoholic women and the comparison group, even controlling for demographic variables and the presence of a parent with alcohol-related problems. Although alcoholic women were more likely to report that a parent had alcohol-related problems, relatively few of the sexual abuse incidents were perpetrated by a parent. The data suggest that vulnerabilities to sexual abuse were attributable to environmental or psychological factors in homes in which a parent was reported as having alcohol-related problems.

Childhood experiences of parental physical violence for alcoholic women as compared with a randomly selected household sample of women.

The effects of childhood experiences of parental violence on the development of alcoholism in women were examined by comparing a sample of 45 alcoholic women selected from local treatment agencies and Alcoholics Anonymous groups with 40 nonalcoholic women selected randomly from the population. Two-hour person-to-person interview schedules were administered to both samples. The Conflict Tactics Scale (CTS) assessed both father-to-daughter and mother-to-daughter relationships. Type of sample was regressed on each CTS subscale, controlling for presence of parental alcoholism, number of childhood changes in family structure, present age of respondent, and present income source. Alcoholic women were found to have higher father-to-daughter negative verbal interaction, moderate violence, and serious violence than household women. Father-to-daughter positive verbal interaction was found unrelated to membership in the alcoholism sample. None of the mother-to-daughter subscales were found to predict membership in the alcoholism sample.

Using panel data to examine sex differences in causal relationships among adolescent alcohol use, norms, and peer alcohol use.

This paper uses longitudinal data and multiple regression of follow-up data on baseline data to identify direction of causality among adolescent alcohol use, normative structure toward alcohol, and peer alcohol use. Baseline and follow-up data were collected on a random sample of 100 adolescents (54 males). Separate regressions were performed on male and female respondents. Among males, self-drinking and normative structure toward alcohol were found to have a reciprocal relationship over time. No significant relationship was found between self and peer alcohol use over time among males. Among females, close-friend alcohol use was found to be causally prior to self drinking and other-friend drinking level. Normative structure toward alcohol was found unrelated to other variables over time among females.

Mesozoic mammals from Arizona: new evidence on Mammalian evolution.

Knowledge of early mammalian evolution has been based on Old World Late Triassic-Early Jurassic faunas. The discovery of mammalian fossils of approximately equivalent age in the Kayenta Formation of northeastern Arizona gives evidence of greater diversity than known previously. A new taxon documents the development of an angular region of the jaw as a neomorphic process, and represents an intermediate stage in the origin of mammalian jaw musculature.